Sdr mode: contrast 50, backlight: 80, color :50
HDR mode: contrast 75, backlight:95, color: 65
Other picture settings I used are
Hdmi: enhanced
Mode: HDR standard
Noise reduction: high
Digital noise reduction: medium
Color mode: native
Flesh tone; brightness= -5
Bro you can easily notice the difference between HDR and sdr mode picture quality for sd channels, just test in some channels like b4u music, once in sdr mode and then enable HDR mode, it is improving the picture clarity..in hd channels only color difference