I've recently bought a new USM version and it's excellent. It's nice and sharp right from wide open and the colour reproduction and contrast is great. I did try the Sigma 24-70mm f/2.8 EX DG Macro and was all set to buy it but the photos were just not that good. I couldn't afford a Canon 24-70 L and the Tamron just didn't feel like it was that well built but gave me some good photos when I tested it, so I just went for the new Sigma USM.
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