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Who cares? This is NRF not CRF. With that kind of statement I don't see the relevants to Nikon.
I've never bought a super telephoto lens that hasn't been used at the long end for less than 98% of the time, and I'm willing bet most people using a lens like the 80-400mm VRII don't either.
The Canon 400mm F5.6L is a very good lens, and beats the 80-400mm VRII on test charts, so there is room improvement, but I don't really see the need either.