The point to a 27" 4K monitor is two fold: - More stuff on the screen. Some people can see all the pixels of a 4K display. or - More detail on your stuff. So

The point to a 27" 4K monitor is two fold: - More stuff on the screen. Some people can see all the pixels of a 4K display. or - More detail on your stuff. Some people really enjoy crisper lines. There is no point to scaling one 1080p-sized-pixel to be represented by four 4k-sized-pixels, à la a digital zoom on a camera, if that's what you mean.