I went from a 4k screen (Asus PB287Q) to an Acer Predator X34. Whislt gaming on the 4K screen things looked nice but it wasn't really "different" if you get me. Also having to run in lower resolutions looked bad and all round blury, which is not something i enjoyed. However moving to the Acer i have had improved performance since it's less pixels, a nice curved IPS screen and ultra-wide is so frigging cool (provided a game supports it...looking at you Blizzard :finger. Give it a couple more years and 4K will be worth moving too but for me personally I didn't find the jump that great for gaming, would have been a nice size to do visual work on though.