But what about that Tamron SP 24-70mm f/2.8 Di VC USD G2? It offers everything the sigma does and is $1199 (same price but you do not get the Tamron TAP USB dock). I have not shot with the Tamron 24-70 yet, but based on my research the two are extremely similar - I think the Sigma offers slightly better bokeh and better quality control - you are more likely to get a sharp copy - this is something that Tamron has struggled with in the past on some of their lenses but the Tamron is lighter and some claim offers better VC. So while I can recommend the Sigma you should think long and hard - the Tamron may be just as good for you and a little lighter in your bag. Canon owners, if you don't care about image stabilization, the Canon 24-70 f/2.8 IS II is currently just $400 more, noticeably lighter and a bit sharper. The weight and sharpness of the Canon is hard to beat.Download RAWS to compare Sigma 24-70 OS HSM ART vs Canon 24-70 f/2.8 USM IIIf you would like to have in-depth discussions with me about which gear is right for you - consider joining the Photo Enthusiast Network - free 10 day trial at http://photorec.tv/PEN and not only can we have those discussions but you get access to HOURS of photography training videos, lightroom and photoshop tutorials and an awesome community of supportive individuals.