Thanks to You I found this: http://4k.com/movie
Post# of 96874
http://4k.com/movies/
Probably a dated article:
Looks Like it could be an early 2014 Article.
Review of 4K UHD Streaming service Companies.
*****************************************UltraFlix *******************************************
Is mentioned
What they offer:
"Ultraflix is a new arrival on the 4K streaming block and they have nowhere near the publicity of Netflix or Amazon. Nevertheless, the company is determined to be the king of 4K and they are working very hard to ramp up their selection of 4K titles to unbeatable levels.
Currently, Ultraflix is only available on Samsung, Sony (upcoming) and Vizio TVs and its smart TV application offers its titles for 48 hour rentals, with no subscription or purchase option yet available although these are both in the works.
For the most part, the selection from Ultraflix is still in need of some much better content. They give you 500+ hours of 4K viewing but most of the material thats available is not exactly exciting."