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you need at least a 40 inch HDTV to tell the difference between 1080p and 720p. How big are the screens going to have to be to tell the difference between blu-ray and 4k? I would say at least 60 inches, which is currently much larger than the avg. TV. Now at 4k and a screen that big, the above poster is right, people are going to start to get motion sickness.

Some movies such as Ratatouille are only done in 2k, so 1080p is practically as good as it gets (2k is measured in horizontal pixels, 1080p is 1920x1080).

The CEs are much better off doing things like 3d, than increasing the resolution.