So for anyone who's used the 70-200II, I think it's safe to say it is SHARP wide open. I rented a copy a few months ago and was blown away at the sharpness on both FF and crop. That being said, if they ever made a version III, what would they actually do to improve on it?! Sharpness is already there, it's quick, got great IS, etc. Weight? Even more stops of IS?
I'm just generally curious.