For a short time I had a Sigma 28-70mm 2.8 that was around the $700 CDN mark brand new. It was an excellent lens and a solid performer. Money well spent. However, I came across a Canon 24-70 2.8 L used for a small amount more, and was offered 100% back for the very slightly used Sigma. Too good a deal to pass up. I must say though that aside from AF speed and noise, I don't see much difference in the results.
Cheers
njw
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