My eyes aren't quite as sharp as they used to be, but there is still a substantial difference between a 1080p monitor and a 4k monitor, even at those sizes. Can't use it to display that much more, but text is smoother.(A retina ipad has higher dpi than a 4k 17", the dpi on a 4k 17 is identical to my old 13.5" surface book.) I do wish windows would let you scale different monitors to different custom dpis though. You can do it if you stick to the 100%, 125%, 150% etc levels, but not if you want to do something like 114%