I tested the Canon 28-105 3.5 to 4.5, Sigma 24-70 2.8, Canon 50mm 1.8, Canon 18-55 3.5 to 5.6. I would say this Tamron 17-50 2.8 my dream lens. I bought the Canon 28-105 3.5 to 4.5 for focal length, but was very sorry for his softness and returned it. So I went to the Sigma. It's a big, heavy lens and very solid. Based on assessments, it should be very sharp. But it was not true in my case. No matter how hard I tried, I never got clear picture. I think I was lucky enough to have a good copy and returned it for a week. Finally I bought Tamron 17-50mm 2.8. It surprised me from the very first picture. Sharpness is as good as the Canon 50mm 1.8 Prime, benchmark index. Contrast is very good and color too. 7 blade iris provides beautiful background blur. I do so much about sharpness so that the lens is my taste. Focus is very accurate and fast enough, but not as fast as the Sigma. Now I never touch the Canon 18-55 kit lens, the difference is huge. It is true that this lens does not have IS. But for 17-50mm range is not as useful as the telephoto lens. The price is excellent considering the top optical quanlity. Now I feel that I am a pro. :)))
The reasons I chose this lens:
1st widest angle in class (most important for the 1.6x crop factor sensor camera
2nd Very crisp and top quanlity glass
3rd light weighted, small and easy to transport
4th 7-blade aperture for pleasing background (if you own the Canon 50mm 1.8 II, you will see its 5-blade diaphragm opening makes harsh background)
5th great constant 2.8 aperture across the spectrum
6th great price
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