The sensor has larger pixel sizes of 1.34 µm, which ensure more light is taken in for better photography when in poor lighting conditions. (nashvillechatterclass.com)
Xiaomi might have used the 20MP sensor with larger pixel size for better performance in the low - light condition. (phoneradar.com)
The comes with dual PD, dual - core auto focus, f / 1.9 aperture, 1.4 μm large pixel size, 6P lens, and quad LED flash. (phoneradar.com)