This was a quick (and ugly) test I performed with my set of Rokinon "Cine Lenses"
Camera: BMCC 2.5K
Lenses: Rokinon 16mm Cine
Rokinon 35mm Cine
Rokinon 85mm Cine
I cut the image in half and added some contrast and sharpening to the 2nd half to give an idea of sharpness after some manipulation.
Looks like the sweet spot for all these lenses is the f2.8 - 5.6 range. That being said, the BMCC is sort of known to shoot soft and then can be sharpened nicely in post.