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Where can I get it in 4k? I don't really care about the fact that it was taken with a 4k cam without being able to download it in said quality...

Didn't hunt for the source of this one but I did find some true 4K examples here:

CTRL-F 2160p

RED posted this to vimeo which they say is 5K: http://vimeo.com/25424362#at=0