Samsung recently unveiled its newest CMOS sensor, the ISOCELL GN1 with a 50 MP resolution, 1/1.3" physical size, and 1.2μm native pixel size. While one could assume that the 108 MP sensors on the Galaxy S20 Ultra and Mi 10 Pro are better, that couldn't be farther from the truth.
https://www.notebookcheck.net/Samsung-s-new-50-MP-sensor-bests-the-108-MP-sensors-on-the-Galaxy-S20-Ultra-and-Mi-10-Pro.466086.0.html