I used both
I didn't like the Sigma, it was ok for macro use but for normal use the AF was too slow, hunting a lot. The extending barrel was another big no-no I can't understand how Sigma can sell a macro lens that chages size!
I moved to the EF-S 60mm F2.8 if you have an APS-C body go for it, it has been my sharpest lens up to date, compact, light, amazing.
I have the Canon 100 now on my 5DII it's very sharp and very nice but I liked the EF-S 60 even more.
Tamron 90, Tokina 90 are also great macro lenses.
Hope it helps.
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