1080p looks fine on a 4K (2160p) screen assuming whatever you’re using to display it (be that your machine, receiver, or the TV itself in the case of “smart” TVs) is good at upscaling. Worse case scenario it looks the same as 1080p content looks on a TV of the same size, since 2160p is literally just 4x the pixels of 1080p.
1080p can look bad on a 1440p display though, since it doesn’t go evenly in and you’ll need good upscaling.
echodot@feddit.uk 4 months ago
Well they’re really not. The vast majority of TVs in actual use are not 4k.
I have a 4K TV which I basically never use because the interface is so bad. I only have it because I was giving it for free I wouldn’t have gone out of my way and bought one because my PC screen is fine for viewing content and it’s where all the content is anyway.