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Then you are missing out.
I believe in buying the best lens (withing expenditure limits) regardless of the makers name. So far I've never had a single optical issue with any lens, and I own five Sigma's amongst my collection, but if I did get a duff lens I'd either swap it or get it adjusted under warranty.
Well, everyone has their own experiences. Personally, having owned a Sigma 70-200 2.8 HSM I wasn't impressed. I'm not saying I'd never touch a Sigma - as said, my 'gut feeling' would be to stick with Canon.
I have a sneeky feeling that sending my Canon body off to be calibrated against a Canon lens would be an easier ordeal!
I'm far from an expert on this subject, but the whole 'reverse engineering thing'.......... how accurate is it?
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