DxOMark has just tested the Tamron 24-70 f/2.8 VC and concluded that it is an amazing lens. In fact, it was so amazing that DxOMark rated it as the #1 for image quality among all of the major zoom lenses! We have tested and currently use the Tamron 24-70 f/2.8 VC as well and have also observed this great performance. In addition, Tamron is the ONLY full frame 24-70 f/2.8 lens that is also stabilized making it a great walk around lens and a must have for low light shooters, landscape photographers, and hand held video shooters. Check out DxOMark's full test for more information: DxOMark

Also, take a look at our full review with sample images as we put this lens up against the brand new Canon 24-70 f/4 IS to see how a brand new Canon lens does against this Tamron with a stop wider aperture and a $200 less expensive price. 

Amazon has this lens in stock right now with Prime free 2 day shipping in both new & used varieties with some great prices: