Before/After footage of Xiaomi Yi 1080P 60FPS with custom 35Mb/s firmware. Objects in distance appeared soft and re-focusing the lens did nothing to fix this. Applied de-noise of 4096 and the difference is night and day.
Create a text file in the root of your SD card add the following line: t ia2 -adj tidx -1 4096 -1
Save as autoexec.ash and you are good to go.
Below footage is from firmware version 1.1.0 with 35Mb/s bitrate.