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I too just got the 70-200 2.8 IS, have not gotten a chance to strech my "legs" so to speak with it, however intially it is superb. I was just asking the same question about the 1.4x and found and heard from a sports photographer who shoots 300mm prime that you lose some with the 1.4x and too...
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I just treated myself to a new 24-70mm f/2.8 L... which for some reason does not perform as it should. Even when stopped down to 4.0 or greater, sharpness is not satisfying without some serious sharpening in Lightroom. Compared to my other L's (e.g. 70-200 f/2.8 IS), sharpness is lousy...So far I...