Terry - Judging by that graph, Its probably safe to say that the 400/2.8 mkII will be the new 300/2.8... The 300/2.8L is the gold standard of telephoto prime lenses.. A benchmark for supreme accuracy and overall optical quality, and in my opinion, the 2nd best bit of fluorite ever designed (second only to the 200/1.8L) I'd really like to get my hands on a 400/4L DO to be honest.. I think that would be a superb piece of kit... Fast and long but not super heavy... I could hand hold a 400/4L DO... but the 400/2.8 is a monster and would require a monopod at the very least, but I'd think a gimbal/tripod arrangement would be needed to do it any justice...
I drool at big lenses... haha One of my many... many weaknesses... .
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