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Hmm I used to have some sigma lenses years ago, purely because I could not afford the canon lenses that went with the camera at the time. I bought them both new, and they were both OK, but not great, the sigma zoom was one that you slid up and down, like a telescope, and it was really really hard to get it to the right zoom point (This was years ago so don't bite my head off). When back in the late 90's I bought an EOS 3, I also bought some canon lenses to go with it. The quality difference between the new canon and the older sigma was tremendous. For this reason, I've always since then bought canon lenses to go with my canon cameras. I also have a canon G7 for taking in my bag if I'm going somewhere and don't want the full setup. It takes some brilliant photos.
Anyway, in my experience the canon lenses were far superior to the sigma, but maybe in the last 14 years or so this has changed..
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