Chris and Jordan shot this colorful sample gallery with the Sigma 28-70mm F2.8 DG DN while filming their review of the lens for DPReview TV. Check it out and judge image quality for yourself.
When viewing this gallery, please note that Chris shot these sample photos using a Sony a7R III. Currently, it seems that regardless of how the camera is set up, distortion correction information for this lens is not applied in Adobe Camera Raw. As such, you will see distortion in some of these images (which Chris called out in the DPRTV review). In contrast, the gallery we shot with an L-mount copy of the lens in Seattle benefits from a distortion correction profile being applied automatically to the Raw files from our Panasonic Lumix DC-S1R. We are in contact with Adobe to learn more about this issue.
View the Sigma 28-70mm F2.8 DG DN sample gallery