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| EF 400mm f/2.8L IS II - Sample Images |
If you have used a 70-200 IS I and II, the improvement to my eye at least is similar.
That sort of a comparison hinges on the quality of particular lens copies we happen to own.
My old 70-200 f/2.8 IS MkI was mediocre at best, therefore the sharpness jump to 70-200 f/2.8 IS MkII was significant.
However, my 400 f/2.8 IS MkI is a beautifully performing lens, and I'd be hard pressed to sign on the statement that my 400 II has better IQ, although it is just possible that my 400 II has a very slight sharpness edge which in practice has little consequence. In addition, both lenses have a very fast AF drive, just that they are tuned differently, therefore a direct comparison is not straightforward.
My 70-200 I was the finest zoom lens I had ever used or owned prior to obtaining the 70-200 IS II. My 400 IS I was also very very good. It didn't focus as fast as my 300 2.8 IS and wasn't as sharp as my 200 1.8 or have the IQ of my 135 but that is no surprise to anyone who's used or owned these two lenses.
It is hard for me to see how Canon could improve on what they have accomplished in the 400 IS II but I'm certain they will.