Just your regular 27" 4k monitor. If I set it to 200%, everything is fine, but things are huge. I have to have it on 175%, and that makes the font very blurry. Also, any window decorations that are not default plasma get blurry, too. I’ve already posted about it in the kde instance and zamunda (a KDE dev) said it was fixed in plasma 6. So, I guess I’ll just wait it out.