Leica has now officially unveiled the Leica Vario-Elmarit-SL 24-70mm f/2.8 ASPH lens and, well… it looks like it’s basically the Sigma 24-70mm f/2.8 DG DN Art lens in a different housing. The specs of the two lenses are virtually identical, except the one with Leica written on it is more than two and a half times the price at $2,795.
The number of elements, groups, minimum focus distance, magnification factor, everything is basically the same. The only real difference seems to be that the Leica uses a metal housing instead of Sigma’s carbon-composite housing. What other changes there may be internally are unknown. But it almost certainly seems to be using Sigma’s optics.