I agree with people who're mentioning the 200-400 lens. The current 100-400 is good enough; it's sweet if it will get any better but before that I will be more happy to see something like a 200-400 comes along -- the 200-400 will be a new lens and it will rival the Nikon.


For most people who has a 70-200 lens (me included), the 100-400 will become attractive only when it goes beyond 200mm. I'm not the one to use 200-400mm that frequently, so I found a 70-200/2.8 +2x will save a lot of money and weight.


Canon, stop redo your homework which has already been marked A. a 200-400 lens will make more sense to have in Canon's lineup than a updated 100-400 lens!