The Sigma 105mm F1.4 DG HSM Art debuted earlier in the year, around May, and is priced around $1400/£1500. From the DG designation you can tell that it’s a full-frame lens, and it’s available in Canon, Nikon and Sigma mounts. It is of course targeting the superb but pricey Nikon AF-S Nikkor 105mm F1.4E ED, but would also appeal to Canon users, where a high-speed L-series model in that focal length is strangely absent from the line-up. It may also be possible that it becomes available in Sony FE mount; it is already suitable for mirrorless cameras. Sigma has recently introduced some Art series in Sony FE mount, that effectively…