How noticeable is 4K gaming compared to 1080p?
Depends on the size of the monitor/TV and how close youre sitting to it. For a 43 TV that youre sitting a hands distance from, its quite noticeable (the specific situation was using the TV to play racing sims, with the TV placed roughly where your cars windshield would be). If you go and sit on the couch, though, it becomes impossible to tell which is 1080p and which is 4K. Heres a chart that you can use: