I've had the 5K LG 27" monitor for about 5 years now and 4K monitors just look blurry now. Feels like you can count the pixels even though you can't.
Reading VSCode off this monitor feels like reading analog text on paper. It's amazing for eye strain. Really doesn't feel like you're staring at a screen all day.
I experienced the same thing, even more abruptly, when I switched away from a 32 inch 4K monitor to a Samsung CRG9 49-inch monitor. Feels like I can count the pixels on the 49 inch monitor. I love the wider real estate, but now I want something with at least the vertical pixel density of the 4K monitor, but the same height as a 32 inch, and the same width as a 49 inch. Whatever that comes out to be.