Hey Sean, thanks a lot.
The closeups were used just for the... close-ups. This isco is incredibly sharp, we shot most of the film at f/2.8 - f/4, but even at f/1.4 the adapter is very precise.
We didn't crop anything (apart from the digital zoom-ins and 2 shots done with the 35mm + diopters, because of the vignette), basicly we just squeezed the image to a 2.40 ratio in Premiere for the final export.