The new Sigma Artisan 35mm f/1.4 DG HSM lens one of Sigma's new premium lenses, signified by an "A" sticker on the side of the lens. The new (A) Artisan label will be used for all future premium Sigma lenses, while (S) Sports will be used for bright telephoto and telephoto zoom lenses, and (C) Contemporary will be used for standard zoom, high zoom, and compact lenses. Further details can be found in the Sigma press release
Sigma 35mm f/1.4 DG HSM Hands-On Photos of Equipment
The new Sigma USB lens mount lets you connect your Sigma lens to a computer so that you can update the firmware, as well as adjust the focus depending on your shooting needs, or to adjust it so that it is correctly adjusted for your camera body. The adjustments are made using software from Sigma called SIGMA Optimization Pro.