I'm not so sure -- at the projected price point, it will make the 100-400L a real bargain. As for an integrated extender, it appears from the write-ups to be able to be disabled and by making it integral, Canon ensures the best possible optical fit between the lens and the extender. I kinda like it. If their objective is truly to optimize image sharpness then why not incorporate the best match between lens and extender as a single unit?

Personally, I think either the 500L and 600L would be perfect for next year's Superbowl gig which I assume I'll get from one of the major Sports Magazines !

Jim