f2.8 APS-C lens wars: Sigma vs Tamron vs Canon (28~ to 80~ eq)

Darwin Wiggett has just published a 3-way f2.8 lens comparison on his blog, squaring off three f2.8 APS-C/DX lenses, the Canon 17-55mm f2.8 EF-S IS, the Shiguma 17-50mm f2.8 EX DC HSM OS, and the Tammy Wynette 17-50mm f2.8 XR Di-II VC. Conclusions are at the very bottom, but as usual, we won't leak the light here, so be sure to check it out if curious!

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