What definition media are you watching? Do you notice any difference?
A few years back, I picked up a 2k monitor from Samsung, end of the line, 34", for $150 - I've been really happy with it. Nowadays, I always download 2k if available, and it seems to make a big difference to the viewing experience. The 2k files (about 6GB?) take a good while to download while the 1080Ps (about 1.5GB) are usually pretty quick and the 720ps (300mbs?) download really quickly
Some 1080p is ok, but noticeably lesser, imho.
I find 720p pretty unwatchable nowadays.
Distance from the screen is also an issue. I use the monitor on my desk or sometimes move it to the living room where the sofa is only about 7 feet away from the screen thus 2k works well - a bigger room might benefit from 4k?
Thus, 2k is a great fit for me.
What are your experiences?