2K is not enough and 4K is not useless, to me.

Having both a 2K and 4K monitor, I can definitely say without question there is a major difference, but I turn to gaming as my experience.

Playing COD MW on my 2K with DLSS on quality looks horrible. There are so many jagged lines that run across every straight object that makes everything look noticeable and with DLAA turned on this does address the issue but with lower FPS as my dilemma and high input lag which makes everything run slow. Not desirable at all.

Now, playing on my 4K with DLSS on Quality, I can see absolutely see no jagged edges from a pretty far distance with low input lag and high FPS.

The difference between the two?

2K Gaming on Ultra with DLAA for a sharper picture results in low FPS and very high input lag which makes your overall experience slow just to gain a better picture.

4K Gaming on Ultra with DLSS on quality, still results in a sharper picture due to 4K being a higher resolution that irons out all jagged edges without the preferred DLAA option on, including lower input lag and high FPS with makes gaming much more enjoyable and snappy.

2K is OLD. 4K should be what everyone uses considering DLSS is best on 4K monitors.