The Mix 4 is the first smartphone from Xiaomi with a front camera under the display. The glass and ceramics clad 6.67-inch smartphone offers additional purchase arguments with its high-end Snapdragon 888+ SoC, up to 12 GB of RAM, an AMOLED panel, and a triple-camera system with 108 MP. In addition, there is also quick charging at 120 watts, recharging the battery in less than 30 minutes.
https://www.notebookcheck.net/Xiaomi-Mix-4-smartphone-review-High-end-with-an-invisible-selfie-camera.583427.0.html
well that doesnt seem right... all photo samples from every other phone you tested EXCEPT mi mi 4 were in 3:4 while mi mi 4 was in 9:16 the latter will always not be as good a pic... even the ultrawide pics everyone was 3:4 except mi mix 4 ...was again 9:16... not consistent at all there an kiiinda makes it feel like its done on purpose to make it look bad