You have HDR on?

I just watched episode 3 of monarch and it was crispy, so not a universal problem.

Which Apple TV 4k 1st, 2nd or 3rd gen?

Nope. Tried a new cable?

This is hard to gauge. I'm not having any issues and viewing experiences are very subjective. I don't use Dolby Vision/HDR and that's a personal preference of mine. I believe the Apple TV app is updated with tvOS and not like other apps where they can be updated routinely... someone can correct me if I'm wrong. Did this start "out of the blue" or with a certain update?

I notice Seinfeld on Netflix looks weird for closes ups and action but when it goes wide angle for buildings it’s crisp 4k looking

My LG tv did a couple updates so I’m thinking it’s going to be the tv settings I haven’t had time to mess with yet

Weird. Everything but Netflix looks great for me.

I’ve been experiencing a similar issue while streaming with the AppleTV app on my AppleTV. Video has intermittently been obviously compressed / pixelated. Not a hardware nor network problem. Only started a few days ago.