This is a desk-filling display in the truest sense of the term: 37.5 inches on the diagonal with a 21:9 aspect ratio and a native resolution of 3840×1600. It has fewer pixels than a true 4K or Ultra HD display, but its sheer size makes up for it in some unique ways. While the UltraFine 5K and 27UD88 displays work best at Retina or scaled resolutions, the 38UC99 uses a full 3840×1600 desktop that leaves everything on screen at just the right size to be useful. No, it’s not a Retina display in this mode, but until we have 8K displays this will have to do.
Even without Retina resolution, this display is impressive. The sheer size of it gives you so much flexibility in terms of your workspace. I can easily have three large windows open side-by-side with room to spare… More at MacRumors.
I can’t imagine how impressive that is to use in real life.