Allow me to offer this horribly disqualifying language up front: I am a mere hobbyist - not a display expert, so please take what I say with a grain of salt. I have toiled for months to find what I feel are the optimal settings, and I'd like to share them with you.
I've had the good fortune of owning two LG CX screens - one in the living room and one in the office for a PC monitor. The colors are rich, the contrast is deep, the black is pure, and HDR at 4K makes the image absolutely pop with detail and vibrancy. No matter what size screen you are using, and whether you're using it for PC games, console games, bluray, or UHD discs - once you go OLED, it's hard to go back to any other type of display. The larger LG OLED screens (55', 65', 75') are going into living rooms, and the smaller screen (48') is going into offices as a PC monitor. LG, at the time of this writing, might be considered the leader in this space.
Hello, Shacknews! OLED televisions are becoming more affordable each year.