You asked
Sigma 105mm f 2 8 dg dn macro art vs leica apo macro elmarit sl 100mm f 2 8?
Both are 100 to 105mm f/2.8 macro lenses with autofocus and no stabilisation, so the choice comes down to your mount.
The Sigma 105mm f/2.8 DG DN Macro Art is the one I'd pick for most people. It comes in both Sony E and L-Mount, and it fits a much longer list of bodies, including plenty of Sony APS-C cameras. It also gives you a little more reach at 105mm.
The Leica APO-Macro-Elmarit-SL 100mm f/2.8 is L-Mount only. It's the sensible choice if you already shoot Leica SL or a Panasonic or Sigma L-Mount body and want to stay in that system.
Written by Claude from this site's pages.