crimsonblack wrote in post #11274779
The Canon 15-85 is like $700 and $450 for the Sigma 17-70. I would get the Sigma and then a Canon 50mm f1.8 and still have a few dollars in my pocket. The big question is is the Canon image quality $250 better.
I had the non-OS version of the Sigma, which is said to have slightly better IQ than the OS, and replaced it with the 15-85. No regrets at all. I lost the nice macro ability of the Sigma, but to my eye, the overall color and contrast of the Canon is better. The USM focus of the Canon is faster than the micro-motor of the non-OS, and much more reliable.
Is the Canon $250 better, perhaps not, especially when you can get part or most of the way to adding a quality prime for the difference. Although, I picked up the Canon when it had the rebate, so I only paid something like $600 new. For me it was well worth the additional cost because I sold the non-OS and a 10-20 to get into the 15-85 as I needed a single(ish) lens solution in that zoom range.