You're sitting close enough to a large screen that you can benefit from 1080p. Indeed, at that distance, I think you might just be able to get some benefit from

You're sitting close enough to a large screen that you can benefit from 1080p. Indeed, at that distance, I think you might just be able to get some benefit from 4k. Most people do not sit 1.5m from a 50" screen however. (I'm assuming that the calculations in this blog post: http://carltonbale.com/1080p-does-matter/ http://carltonbale.com/1080p-does-matter/ are correct.)