Lomskij's reviews
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Sigma 100-300mm f/4 EX IF HSM APO
8 out of 10 points and not recommendedBuilt like a tank, fast focusOptics could be better, bokehLet's start with pros - I really like the build quality of this lens, which is unusual for Sigma. It's built like a tank, metal barrel, zoom and focus rings operate very smooth, nothing to fault here. Also the autofocus is really silent and accurate, another plus for Sigma.
reviewed June 8th, 2010
Now what I didn't like: sharpness is ok. Not great, but usable. CA's (it's not true APO lens after all) as well. Completely useless as a portrait lens - while f4 is fine at 300mm, having the same at 100mm means that the DOF control is rather poor, also bokeh is simply horrible.
All in all it's not a bad lens, however it can't compete with 70-200 f2.8, especially stabilised ones.