I game on my PC at 4k/60 with HDR and I can tell you, there is a good difference between 1440p and 4k. I only use a 55inch TV and I can tell night and day the difference. Just like I could tell the difference between 900p and 1080p.
Once you start getting use to a resolution, you can tell when it changes. Once you get use to 4k, you can tell when you play a game that isn't in 4k.
I am not saying 1440p or 1080p are bad resolutions however compared to 4k, there is a eye popping difference.
In my experience, there is not an eye-popping difference between 1440p and 4K in games. A difference, yes, but not that overblown. This comes from someone who games in 1440p/144Hz on PC and 4K (Dynamic/Native ~ this matters) 30-60fps on the Xbox One X. I generally prefer the former because the difference is not as big as one would expect and PC games have better graphics anyway. Once higher res monitors take advantage of higher Hz in abundance (I'm waiting on 8K/120-144Hz for PC, since that's when rendering will truly shine), then things will stomp 1440p!
That said, watching movies in 4K vs 1440p is where the difference grows on the eye, and HDR is a Godsend, but for gaming the difference isn't as big when just talking those two resolutions.Last edited by CGI-Quality - on 16 August 2019