Quote (Canadian_Man @ Sep 15 2013 11:07am)
Hands down the Canon 24-70 f2.8 out of the four choices I think.
The sigma and tamron 24-70 lenses trade up a lot, but are still good lenses. I did a lot of research on the 24-70 f2.8 line-up a little while ago (between canon, nikon, tamron, sigma)... personally I think you're breaking 1k so don't settle for extra CA's, less sharpness, and other worse image quality features.
I agree, it's the only lens in your list I have owned, so maybe I'm biased, it's a good lens
However it's massive and heavy, that's why I got rid of it. I have no idea about the other lens' on the list, but it's so heavy it hurts your shoulders on a full day out on a large ff dslr. Also for the money I prefer primes. I would have a 24 2.8, 50 1.8, 85mm 1.8, in my bag over any zoom in this price range