Personally I'd steer clear of the Xeen CFs because they're the same glass as Rokinon's cheaper lenses just with fancier housings. I have a cinevised set of Leica R lenses and love them. You can get a good Leica 35mm summicron for about half the price of a new Xeen CF. If size is the main factor for you, another option (that's a bit more expensive) would be a 32mm Zeiss Standard Speed, which is even smaller than the Xeens.