I bought the LG C3 55 OLED and it's very comfortable for me. The thing that seemed to make it work was to enable HDMI Deep Colour under the HDMI Settings (under External Devices) and then on my input device, in this instance a Sky Q TV box, to enable 10-bit output (under the picture resolution settings in the Audio Visual menu). So I think it has a 10-bit signal from the box going into a TV that is natively 10-bit and so, I assume, no dithering. I can literally watch it with no strain.
Before finding this Deep Colour setting, I had made it usable although not perfect for me by using Filmmaker mode (to reduce as much of the motion, sharpening etc visual effects) and also using eye care mode. I still have those settings on now, but it's the Deep Colour/ 10-bit setting that seems to make this 100% good.
I'm not confident enough to connect it to a network and risk an update though, in case that messes it up! I need to see if Apps via the Sky Q Box or via my Apple TV 4K work or not.
@Lauda89 I think I saw you say somewhere that your LG Oled had become problematic after an update. Are you able to get the Deep Colour setting working with a 10-bit signal from an external device via HDMI? I wonder if that would still work despite your updates. I assume it might.