The-Digital-Picture has completed their extensive review of the Sigma 24-70mm f/2.8 DG OS Art series lens.
From TDP:
The promise of Sigma Art lens quality coming to the 24-70mm focal length range along with an f/2.8 max aperture and optical stabilization had a large number of photographers signing up to add this lens to their kits immediately on announcement day. Does the Sigma 24-70mm f/2.8 OS Art Lens fulfill Sigma's “It’s Here to Steal the Spotlight” promise? From the perspectives of many, it was hoped that this lens would get that spotlight for its exceedingly sharp image quality performance and from that perspective, I'm sure that there is some let-down among the hopeful. However, this lens is optically competitive and it performs quite well for the price. Read the full review
This is definitely a lens that should be on your shortlist if you're looking for an affordable 24-70mm f/2.8 stabilized lens.