I just shot a few test photos and the Canon 17-55 is noticeably sharper than the Tamron 17-50 wide open. Focusing seems so much faster too, especially in low light indoors, which I obviously knew beforehand.
I have to wait until daylight tomorrow to shoot some pics outdoors. So far I am impressed. It seems to be focusing correctly, no front/rear focus. The zoom and focus rings seem to be smooth despite what others have said.
Canon 17-55 wide open 100% crop
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Tamron 17-50 wide open 100% crop
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Canon 17-55 wide open 100% crop
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Tamron 17-50 wide open 100% crop
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but finally I found just one copy and going to buy it tomorrow !


