If you're working from 4K files, but you're finishing at 1080p, I'm wondering what percentage you should be able to scale up/zoom-in on a 4K image before you have noticeable loss of resolution. I would think that at 1080p, you're "throwing away" a certain amount of resolution when finishing at 1080 anyhow. Any suggestions? I don't think it's as simple as 1080p is about 200% (math!?) bigger than 4K, so you should be able to zoom in 200%. Or is it?