Sigma 24-70mm F2.8 DG DN | Art field review: Digital Photography Review
Amazon.com : Sigma 24-70mm f/2.8 DG DN Art Zoom Full Frame Compatible with Sony E-Mount Lens with LaCie Rugged Mini 1TB Hard Drive and 64GB SD Card Bundle (3 Items) : Electronics
Sigma 24-70mm F/2.8 DG OS HSM A for Nikon review: Good value standard-zoom - DXOMARK
Sigma 24-70mm f/2.8 DG DN Art Lens for Sony E 578965 B&H Photo