Xiaomi Mi 11 Ultra vs Samsung Galaxy S21 Ultra

Here we compared two flagship smartphones: the 6.81-inch Xiaomi Mi 11 Ultra (with Qualcomm Snapdragon 888) that was released on March 29, 2021, against the Samsung Galaxy S21 Ultra, which is powered by Exynos 2100 and came out 2 months before. On this page, you will find tests, full specs, strengths, and weaknesses of each of the gadgets.

Key differences

An overview of the main advantages of each smartphone
Reasons to consider the Xiaomi Mi 11 Ultra
  • Better camera quality (According to DxOMark rating)
  • Slow-motion recording at 1920FPS
  • Has a built-in infrared port
Reasons to consider the Samsung Galaxy S21 Ultra
  • The rear camera has a 10x optical zoom
  • Shows 23% longer battery life (31:14 vs 25:28 hours)
  • Delivers 8% higher peak brightness (1013 against 941 nits)
  • More recent OS version: Android 13 versus 12
  • The front-facing camera can record video at 4K
  • Ready for eSIM technology

Review

Display
Screen quality, color accuracy, brightness
Performance
CPU/GPU performance in apps and games
Battery
Battery life, charging type and speed
Camera
Photo and video recording quality
Connectivity
Networks, ports, data transmission
NanoReview score
Final comparison evaluation

Value for money

You can enter your local price of these phones (in USD or any other currency) and click on the "Calculate" button to see which one has a better value for money.
Price

Tests and specifications

Comparison table of technical specifications and tests

Display

Type AMOLED Dynamic AMOLED
Size 6.81 inches 6.8 inches
Resolution 1440 x 3200 pixels 1440 x 3200 pixels
Aspect ratio 20:9 20:9
PPI 515 ppi 515 ppi
Refresh rate 120 Hz 120 Hz
Max rated brightness 900 nits 1500 nits
Max rated brightness in HDR 1500 nits -
HDR support Yes, HDR10+ Yes, HDR10+
Screen protection Gorilla Glass Victus Gorilla Glass Victus
Screen-to-body ratio 91.4% 89.8%
Display features - DCI-P3
- Always-On Display
- DC Dimming
- DCI-P3
- Always-On Display
Display tests
RGB color space 99.8% -
PWM 510 Hz -
Response time 2.8 ms -
Contrast ∞ Infinity -
Peak brightness test (auto)
941 nits
1013 nits
Sources: NotebookCheck [3], [4]

Design and build

Height 164.3 mm (6.47 inches) 165.1 mm (6.5 inches)
Width 74.6 mm (2.94 inches) 75.6 mm (2.98 inches)
Thickness 8.4 mm (0.33 inches) 8.9 mm (0.35 inches)
Weight 234 gramm (8.25 oz) 227 gramm (8.01 oz)
Waterproof IP68 IP68
Rear material Ceramic Glass
Frame material Metal Metal
Colors White, Black Black, Silver, Gray, Blue
Fingerprint scanner Yes, in-display Yes, in-display
Screen-to-body ratio
91.4%

Performance

Tests of Xiaomi Mi 11 Ultra and Samsung Galaxy S21 Ultra in the benchmarks
SoC
Chipset Qualcomm Snapdragon 888 Samsung Exynos 2100
Max. clock 2840 MHz 2840 MHz
CPU cores 8 (1 + 3 + 4) 8 (1 + 3 + 4)
Architecture - 4 cores at 1.8 GHz: Kryo 680 Silver (Cortex-A55)
- 3 cores at 2.42 GHz: Kryo 680 Gold (Cortex-A78)
- 1 core at 2.84 GHz: Kryo 680 Prime (Cortex-X1)
- 4 cores at 2.2 GHz: Cortex-A55
- 3 cores at 2.8 GHz: Cortex-A78
- 1 core at 2.9 GHz: Cortex-X1
L3 cache 4 MB -
Lithography process 5 nanometers 5 nanometers
Graphics Adreno 660 Mali-G78 MP14
GPU clock 840 MHz 760 MHz
FLOPS ~1720 GFLOPS -
Memory
RAM size 8, 12 GB 12, 16 GB
Memory type LPDDR5 LPDDR5
Memory clock 2750 MHz 2750 MHz
Channels 2 2
Storage
Storage size 128, 256, 512 GB 128, 256, 512 GB
Storage type UFS 3.1 UFS 3.1
Memory card No No

Benchmarks

Geekbench 5 (Single-Core)
Geekbench 5 (Multi-Core)
AnTuTu Benchmark 9
772555
CPU 198271 191240
GPU 290845 256481
Memory 131669 151369
UX 151935 149052
Total score 772555 742754
3DMark Wild Life Performance
Stability 91% 69%
Graphics test 31 FPS 31 FPS
Graphics score 5308 5221
PCMark 3.0 score 13096 -
AnTuTu 9 Ranking List (102nd and 113th place)
Sources: 3DMark [3], [4]

Software

Operating system Android 11 (Can be upgraded to Android 12) Android 11 (Can be upgraded to Android 13)
ROM MIUI 13 One UI 5.0
OS size 31 GB 26.4 GB

Battery

Specifications
Capacity 5000 mAh 5000 mAh
Charge power 67 W 25 W
Battery type Li-Po Li-Ion
Replaceable No No
Wireless charging Yes (67 W) Yes (15 W)
Reverse charging Yes, (wireless) Yes, (wireless)
Fast charging Yes (90% in 30 min) Yes (54% in 30 min)
Full charging time 0:37 hr 1:11 hr
Battery life tests
Web browsing 08:18 hr 10:13 hr
Watching video 12:44 hr 15:32 hr
Gaming 04:46 hr 05:26 hr
Standby 79 hr 98 hr
General battery life
25:28 hr
31:14 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 50 megapixels 108 megapixels
Image resolution 8700 x 5800 12000 x 9000
Zoom Optical, 5x Optical, 10x
Flash Dual LED Dual LED
Stabilization Optical Optical
8K video recording Up to 24FPS Up to 24FPS
4K video recording Up to 60FPS Up to 60FPS
1080p video recording Up to 60FPS Up to 60FPS
Slow motion 1920 FPS (1080p) 960 FPS (720p)
Angle of widest lens 128° 120°
Lenses 3 (50 MP + 48 MP + 48 MP) 4 (108 MP + 10 MP + 10 MP + 12 MP)
Wide (main) lens - 50 MP
- Aperture: f/2.0
- Focal length: 24 mm
- Pixel size: 1.4 micron
- Sensor: 1/1.12", Samsung GN2 (ISOCELL Plus CMOS)
- Laser autofocus
- Optical stabilization
- 108 MP
- Aperture: f/1.8
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/1.33", Samsung S5KHM3 (ISOCELL Plus CMOS)
- Laser autofocus
- Optical stabilization
Telephoto lens - 48 MP
- Aperture: f/4.1
- Focal length: 120 mm
- Pixel size: 0.8 micron
- Sensor: 1/2", Sony IMX586 (Exmor-RS CMOS)
- Phase autofocus
- Optical stabilization
- 10 MP
- Aperture: f/4.9
- Focal length: 240 mm
- Pixel size: 1.22 micron
- Sensor: 1/2.65", Samsung S5K3J1 (ISOCELL CMOS)
- Phase autofocus (Dual Pixel)
- Optical stabilization
Ultra-wide lens - 48 MP
- Aperture: f/2.2
- Focal length: 12 mm
- Pixel size: 0.8 micron
- Sensor: 1/2", Sony IMX586 (Exmor-RS CMOS)
- Phase autofocus
- 12 MP
- Aperture: f/2.2
- Focal length: 13 mm
- Pixel size: 1.4 micron
- Sensor: 1/2.55", Sony IMX563 (Exmor-RS CMOS)
- Phase autofocus (Dual Pixel)
Camera features - Bokeh mode
- Pro mode
- RAW support
- Bokeh mode
- Pro mode
- RAW support
Samples Photo samples of Xiaomi Mi 11 Ultra from DxOMark Photo samples of Samsung Galaxy S21 Ultra from DxOMark
Selfie camera
Megapixels 20 megapixels 40 megapixels
Image resolution 5380 x 3620 7864 x 5200
Aperture f/2.3 f/2.2
Focal length 27 mm 26 mm
Pixel size 0.8 microns 0.7 microns
Sensor type ISOCELL CMOS ISOCELL CMOS
Sensor size 1/3.4" 1/2.65"
Video resolution 1080p (Full HD) at 60 FPS 2160p (4K) at 60 FPS

DxOMark camera tests

Photo quality
Video quality
Generic camera score

Connectivity

Wi-Fi standard Wi-Fi 6E (802.11 a/b/g/n/ac/ax) Wi-Fi 6E (802.11 a/b/g/n/ac/ax)
Wi-Fi features - Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
- Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5.2 5.2
Bluetooth features LE, A2DP LE, A2DP
USB type USB Type-C USB Type-C
USB version 2 3.2
USB features - Charging
- USB-Storage mode
- OTG
- Charging
- USB-Storage mode
- USB-Host mode
- OTG
GPS GPS, GLONASS, Beidou, Galileo, QZSS, NAVIC GPS, GLONASS, Beidou, Galileo
NFC* Yes Yes
Infrared port Yes No
Network
Number of SIM* 2 2
Type of SIM card Nano Nano
Multi SIM mode Standby Standby
eSIM support* No Yes
Hybrid slot No No
LTE Cat* 24 24
5G support Yes Yes

Sound

Speakers Stereo Stereo
Headphone audio jack No No
FM radio No No
Dolby Atmos - Yes
Speakers test
Max. loudness
89.5 dB

Other

Category Flagship Flagship
Announced March 2021 January 2021
Release date April 2021 February 2021
SAR (head) - 0.71 W/kg
SAR (body) - 1.58 W/kg
Sensors - Hall-effect sensor
- Barometer
- Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
- Hall-effect sensor
- Barometer
- Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
*Disclaimer! NFC, GSM network support, and some other specs can be different depending on the country.

Conclusion

These smartphones have a lot in common, but we would recommend the Samsung Galaxy S21 Ultra. It has a better software, battery life, camera, and connectivity.

Cast your vote

So, which phone would you choose?
1558 (54.8%)
1283 (45.2%)
Total votes: 2841

User opinions

You can share your opinion or ask a question in the comments below
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dadash 04 February 2022 16:07
Certainly s22 It's better because it is more stable and Samsung has always been the best
+2 Reply
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Ted 22 January 2022 15:21
Samsung is very good, but it performs poorly in terms of charging speed.
+1 Reply
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dev 27 January 2022 07:00
that's true but the 25 watts charging speed fully charge the phone from 0 to 100 in 1 hour
+3 Reply
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Jerry 06 October 2021 17:30
I have both of these phones, both of them are the best flagship killers, but unfortunately galaxy S21 ultra has software bugs so it show itself during working and in long time.
+21 Reply
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Mokeet 13 October 2021 21:10
What are you saying 😅 Mi 11 ultra's MIUI has the bugs but S21 Ultra's One Ui is clean and fast ui
+14 Reply
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Danial 08 September 2021 19:34
From what we see on cast your vote segment.. its clearly that xiaomi goddamn licker thinking their flagship device could beat samsung flagship even in fact that s21 ultra clearly is better.
+12 Reply
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Jas 29 August 2021 14:03
East or west mi is the best. Within 10 years they beat samsung and apple in many country. And now they are defeating samsung in tv industry and are building their own car.
+7 Reply
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dev 27 January 2022 06:59
you think you know nothing about tech Samsung has 24 percent market share and is 1st place while Xiaomi is 2nd and apple is 3rd and Samsung TVs are way better than mi TVs and Samsung makes the screen for Xiaomi TVs and mobiles I'm not a hater of Xiaomi my cousin uses a mi11 ultra and it's a good phone and has more performance power than the s21 ultra but the camera and battery software Samsung is better I know because I use the s21 ultra.
+1 Reply
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Farooq Khan 19 July 2021 01:28
I just heard from many reviewers that xiaomi just killed Samsung. But please explain how if xiaomi is using Samsung's camera sensor
+29 Reply
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Jas 29 August 2021 13:58
So what? If samsung use their own camera sensor they can provide their phone in cheaper price. But mi provides lower price even though they are using dedicated camera sensor.
+1 Reply
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dev 27 January 2022 07:06
Jas, Xiaomi uses Samsung's screen camera everything so if Samsung is not there neither is Xiaomi.
+1 Reply
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Miguel lopes 06 July 2021 19:24
Nessa comparação em específico eu achei que tava faltando informações então resolvi ver em outros sites e até fui no sites das próprias fabricantes da Samsung e da xiaomi e depois de pensar achei o mi11 ultra melhor o que me atraia ao s21 ultra era o zoom de 100x mas o mi11 ultra tem de 120x tudo bem que o s21 ultra tem zoom de 10x óptico e o mi11 ultra tem de 5x óptico mas para mim 5x é suficiente
+3 Reply
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Jayed AL Sabit 26 April 2021 13:19
Well, to all those saying that the Mi 11 Ultra is better, there is something called 'Software optimization' and camera in which the Mi 11 Ultra barely competes with the Samsung. So it's pretty much safe to say that the S21 Ultra is an overall better value than the Mi 11 Ultra considering that the S21 Ultra can be found cheaper nowadays!!
+34 Reply
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Aadit Kar 10 May 2021 14:24
You're correct bro. Hardware isn't the only thing , in software xiaomi is nowhere around Samsung.
+12 Reply
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Olama 25 June 2021 15:18
I think most people will pick Samsung base on performance and durability
+8 Reply
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Jas 29 August 2021 13:59
Try using miui software it's far better than oneui i have tried both and i can say clearly that miui has more features and it looks beautiful.
+3 Reply
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Jas 29 August 2021 14:00
Aadit Kar, It's not true miui was the first os used in any Android even samsung has used it 10 years back.
+2 Reply
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Jas 29 August 2021 14:01
Olama, Man you didn't even saw which phone has better performance
+2 Reply
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dev 27 January 2022 07:10
Jas, seems you have never used a mi device miui is the worst os i have ever seen and onui is wayyyyy beter
0 Reply
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dadash 04 February 2022 16:20
Jas, miui It has many bugs and regiments, one ui It is more stable and receives updates sooner, so Samsung is always better than Xiaomi, Xiaomi is not worth another year
0 Reply
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