Sigma - 85mm f/1.4 DG DN Art vs Sony - FE 135mm f/1.8 GM

These two are nearly even on the Mars Score (73.2 vs 74.3). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.

Pick the 85mm f/1.4 DG DN Art if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are weight. The single most decisive one: Weight — 325.00 g less. 625 vs 950.

Pick the FE 135mm f/1.8 GM if you care most about min focal / max focal. Its strongest claims are min focal, max focal. The single most decisive one: Min focal: 135 (vs 85).

Both ship with comparable weather sealed, optical stabilization, so those specs do not separate the two — focus on the differences below.

Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.