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I betcha a nickel to a doughnut that of all 100-400 users' shots, at least 99% are taken at 400mm FL. Do you think that 200-400L will be any different ? So much for zoom "versatility".
And you could kindly lead an educational program to teach all the poor lost souls that buy 100-400's, 50-500's, 300-800's, Nikon 200-400's, etc., etc., because they obviously will use them all at the maximum focal-length 99% of the time.