i watched Dune in Blu-Ray quality on 8K 75" screen and my conclusion was ...

75" is way too small. it's my computer screen and is great when i sit in front of it but way too small from the couch.

try to get at least 85" preferably 100" for a nice cinematic experience.

i wouldn't give up 8K resolution though to go up to larger screen size. 8K is not negotiable to me.