I just watched Loom by Luke Scott, produced by his father Ridley Scott.
It was entirely shot in 4K, a 20 minute short specially made to showcase the capabilities of the upcoming RED 4K laser projector.
Needless to say it is visually stunning, the lighting and use of color is amazing. The film itself is an interesting look into a future mix of Blade runner and genetic engineering gone too far.
It's available on you tube at 1 mbps 1280x534
And available for download at 10mbps (1726x720) 1.6gb
http://www.reduser.net/forum/showthread.php?84739-LOOM-ONLINE
(The 4K version is only available at screenings)