Ok, here are my current settings that I use on a 4k Sony OLED, using Game Mode setting and BFI lv2, for anyone that wants to take a look.
Shaders should be uptodate from the dev repo.
Depending on your panel, you may need to dial down “input signal” (if you’re not using a BFI type setting on your panel) and “saturation” slighty, and change "sharp X from -70 to -75 for a little more sharpness (personally, I’d prefer a setting of -72)…If you do change input signal, you may need to slighty adjust “gamma out”.
Edit: should add I use Vulkan.