A few people have mentioned that we should start a 4k thread. Hopefully if this is popular enough that a mod will make it permanent. To start off so far I've wathced Pineapple Express, Chappie, and Enders Game in 4k. I thought Pineapple and chapple looked great, they were crisp and the colors were fantastic. Enders looked better than the 1080p blu but wasn't as impressive.
I know best buy is going to have $17.99 4k movies on black friday, I'm hoping for some $15 one though.
4k price tracker