600 (DO or not) w/1.4X. We already know that can be done based on the 200-400. DO would likely be preferred but It would make little difference to me as long as IQ is the same.
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How can this be unrealistic if Tony said it is “doable”? With, let me guess, around 10 stops of vignetting in extreme corners and a bucket sized front element to the boot.
I am very attracted by the 70-135L f:2 that is already announced, but the price and weight are going to be punishing.
EF 200-500mm f5.6 L -- If Nikon can do it for $1,400, Canon should be able to produce an "L" quality lens for $2,500.
I would say a RF 800mm f/4 DO. Basically instead of making a smaller 600mm lens, lets make a longer lens that hasn't been possible till now.