disagree they dont, you need to look at many things also black to white ratio and brightness distribution among many other things . Which is why good monitors start with price tags 600 dollars and up.
to op 4k means nothin but more cash spent not worth it unless you .have money for it. But it should not be 1080p either, the monitor must at least support 2560 resolution which most pro grade monitors do.
i suggest to go with Dell ultrasharp series.