I had a chance to try some Panavision anamorphics on my 5D2 today. I'm prepping for some 2nd unit work shooting digital timelapse that is supposed to match 1st unit's 35mm film anamorphic. I was surprised to discover that the 50mm Primo fits and works well using one of the Panavision>EOS adapters that was custom built recently at the Hollywood location.
The 50mm Primo T2 covers about 80% of the sensor, resulting in a nearly square "4K" image, meaning that it's roughly 4K wide. But once you unsqueeze the image at 2:1, you are left with something like 3K by 6K! This should be a lot of fun!
If anyone is interested I will try to get some more pics and info as the shoot progresses.