Re: Color gamut on OLED's
Outside of a calibrated set, color gamut in HDR is most accurate in Normal. If a calibrator sets it to Normal, Extended, and or Wide, they under/over compensate saturation/color through white balance tuning to get it correct. For end users without a calibration, any other color gamut outside of normal will oversaturate. Basically, when in HDR the set is already displaying wide color gamut, the color gamut setting is misleading as it deals with the saturation levels in the HDR space. Here is a quick quote from an editor at Sound & Vision, posting at AVS:
"in HDR mode, about Normal vs. Wide, both will provide the same (native primaries) gamut coverage, the largest the TV can display, but the problem is that in Wide it's boosting the lower saturation levels (make them more saturated), so for HDR the Normal is the only correct settings.
For SDR. Wide Gamut option is only helpful when you use the LG in post production for SDR @ ISF mode to calibrate for DCI-P3 or use eeColor for 3D LUT with 65-Point Cube (or other processors with smaller cube size) bypassing LG's poor CMS controls to perform 3D LUT display profiling.
In SDR mode, Normal will provide a slight oversaturated REC.709 coverage while Wide will provide the largest possible (native) so it will oversaturate a lot the colors if you watching HD/Full HD content (blu-ray/sat/cable etc..) which use REC.709. In SDR mode the Normal is the correct setting also. "
Personally, I set mine to Extended and compensate for the higher saturation by putting color at 48.
EDIT: Damn you Genijin, beat me to it