Originally Posted by jimr
How about one more stop of IS plus an increase in maximum magnification from 0.17x to 0.21x? Ok, maybe not enough to justify selling a Mk I and buying a Mk II. But since the current EF 70-200mm f/2.8L IS USM is on my future purchase list and not in my bag, it's a tougher call. If street prices at release really are in the >$2500 range, it becomes a choice of the Mk II versus the Mk I plus some other lens, or even a pair of non-L primes - hmmmm...decisions, decisions.....