Okay, I see a lot of confusion on here... Let me see if I can help some of yall, with some settings that those of us on AVS Forums have sort of decided seem to be good all around general default settings for HDR Gaming. I'll explain the reasoning behind some of the settings, as to make this as clear as possible....
FIRST - If you have messed with your White Balance or Color Sliders and you didn't have a professional actually do it, reset to default. You can not use other's settings for this, and any changes you've done are probably for the worst. You can only get correct values for these via software and a professional that knows what they are doing so they can measure your ambient light and whats coming off of the TV.
Now, On to the settings ( I have the KS9500, basically the newer model of the KS8000, same settings transfer over ) And this is for Game Mode, Not Movie Mode, So yes, there is a number to Sharpness for a reason that is still beyond my total comprehension. But 0 Sharpness blurs the textures out, and too much causes tracer lines and other distortion effects. There is a happy medium, so look for it between what I listed.
Game Mode: SDR / *HDR settings listed ( You have to manually change the HDR settings until Sammy gives us another save slot under the Game Mode Picture Setting )
Backlight 13 *HDR 20
Brightness 45
Contrast 95 *HDR 100
Sharpness 17 ( anywhere from 10 to 20 is good, but don't go over 20 or you will start to get artifacts and other image distortion )
Color 50
Tint 50/50
Smart LED High
HDMI Black Level Normal ( Put your PS4 RBG Range to Full so you won't crush blacks ) (Auto will not work, and causes signals to get mixed up and blacks to get crushed, must manually set to what I've posted to get accurate blacks.)
Dynamic Contrast Off *HDR Medium
Color Tone Warm 2 ( you can set this to another option if you prefer. You won't be getting more accurate colors though, but this is a preference type of thing as well )
Again, Don't touch White Balance
Gamma 0
Color Space Auto ( Used to have to be Native for HDR to work, but Sammy patched it for Auto to work, so it's best to do Auto for now )
Also, make sure you have your PS4 set to YUV420 so that you can get proper HDR 10bit.