Not sure where 1440p would land, but after using one for a while, I was going to upgrade my monitor to 4k but realized I'm not disappointed with my current resolution at all and instead opted for a 1440p ultrawide and haven't regretted it at all.

My TV is 4k, but I have no intention of even seriously looking at anything 8k.

Screen specs seem like a mostly solved problem. Would be great if focus could shift to efficiency improvements instead of adding more unnecessary power. Actually, boot time could be way better, too (ie get rid of the smart shit running on a weak processor, emphasis on the first part).

8K would only work well in a movie theater type setting I guess.

4k 25" was worth it for me but I only spent about £140 on it so YMMV it's nice but not essential and after 1080p the extra pixels only add so much

so if you're in the movie theatre sit as close to the screen as possible