I would ask this question over in the lens area, but think you guys will be able to give me more accurate feedback since I post most of my photos here. I would like to upgrade to a 70-200L, but not sure what one. I want sharper images and can't do the 2.8IS right now so based off of the pics you see from me should I look at a 2.8 non IS or a F4 with IS?
Sigma 70-200 f/2.8 OS .... supposedly the only thing sharper is the 70-200 is mk 2. its definately sharper than my IS mark 1. I tried it out recently at a flickr meet.

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