Sigma 50mm f/1.4 DG Art

Unlike the 35mm & 24-105mm, Sigma had previously released a 50mm f/1.4 lens (which I have not used and thus can’t compare it to). At a suggested retail price of close to $1000, the new and improved Sigma 50mm f/1.4 DG Art sets itself firmly between the cost of Canon’s 50mm f/1.4 (~$400) and Canon’s 50mm f/1.2L. Two questions arise from this positioning; how does