Wide angle: Sigma's new Art lens is fastest 20mm in the world: Digital Photography Review
,Sony Alpha Blog : Sigma 20mm F/1.4 DG HSM Art,Sigma 20mm f/1 4 DG HSM Art Lens Canon,Wide angle: Sigma's new Art lens is fastest 20mm in the world: Digital Photography Review,Sigma 20mm F1.4 DG HSM Art Lens for Canon EF for sale online | eBay