IS or not that is an awesome lens.
Is there an IQ hit between the II and the non-is versions? or are they about the same? (I'd assume they are close since canon chose to discontinue the mk1, but kept the non-is...for some reason) Reason I ask is I'm considering switching out the mk2 for the non-is. Save's me 1000$ and I don't need the IS for what I shoot, if IQ is the same I don't see why not.
The IS will help in lower light situations like gyms where a monopod would not be conducive.
