A higher resolution means less visible aliasing in games. All of this is irrelevant for normal desktop usage/applications, as rendered game frames are different than desktop use. Those who mention resolution, and size and can instantly judge whether or not you can see pixels, are either hawks, or sit a foot away from the screen. Across the room, other than screen real estate, 1080 and 2.5k are going to appear the same, provided the panels used are identical specs, which is never the case, and thus creates a lot of confusion and misinformation. Manufacturers have stopped improving 1080 panels for a while now, to make the jump to higher resolution a lot more obvious, this is especially true for UHD.