bobobird wrote in post #13511195
T2i - the new breed of Sigmas are nothing to be sneezed at. They are all at par or slightly ahead of the Canon counterpart.
From personal experience - the 17-50 is as good as the 17-55, the 70-300 is as good as the 70-300, and the 150 macro is miles ahead of the 100 macro.
"As good" needs some qualifications. There are areas where the Sigmas look to be better (like dust), the same (IQ), and lacking (focus speed). It's not like it's all about IQ at 100%. From the videos I've seen on YouTube, the Sigma focus motor is not nearly as fast as the Canon. Not saying this is the determining factor for everyone, but it was for me.
Besides, the Canon 17-55 doesn't have to be expensive. I spent $800 on mine (perfect condition used). It's clearly worth that price.
I will continue to consider Sigma in my future purchases, but I'm not just thinking about price. I'm interested in the best lenses that fit my budget.