Sigma 340101 35mm F1.4 DG HSM Lens for Canon
When Sigma restructured their lens lineup in 2014 and introduced their top-of-the-line Art lenses, the first such Art lens was the 35mm f1.4 DG HSM Art, and no one could have asked for a better first impression. For a relative song, photographers now had access to a high quality autofocus lens that exceeded what was available from first-party companies for sharpness and image quality. The Art line was a revelation, and to this day Sigma considers the 35mm f1.4 DG HSM Art to be their flagship lens.
Also introduced with this lens was Sigma's new system for allowing users to calibrate their lenses from a home computer with a proprietary USB dock. The USB dock utilizes software to analyze a lenses performance and fine-tune focusing response to produce more accurate, sharper images when autofocusing. In the past, Sigma users complained of focusing performance that tended to drift over time, requiring them to send in the lenses to Sigma to get calibrated. Now, an owner can quickly and easily diagnose a focusing issue should an issue ever arise, and get back to shooting in mere minutes after calibrating from the convenience of their PC or Mac; you can even update the firmware if an update is needed. This is a system unique to Sigma and a godsend to working professionals who can't afford to be without their lenses while they are in the shop.
Until the Canon EF 35mm f1.4L II USM ships, the Sigma 35mm Art lens rules the sharpness roost. And even after the Canon ships, there will be no better value for top-quality performance for 35mm lenses than the Sigma 35mm f1.4 DG HSM Art.