Am I wrong? Is the 70-200 f/2.8 Mark ii a match for the 100-400 and the 400 f/5.6?
I owned the 100-400L I for years before I got the 70-200 II. But the 70-200 II + 2xTC has replaced the 100-400L when I travel. In my opinion, it isn't quite as good, but it is very close to the 100-400L I @ 400 mm and I love the 70-200 II w/o the TC enough to make it worth putting up with the ergonomic issue and maybe a very slight, potentially unperceivable hit to IQ. That said, when I am home and if I want 400 mm, I take the 100-400L, but that is mostly for the ergonomic issue, not IQ.
So, are you "wrong" meh....I wouldn't fault someone for going either way.