Canon - RF 24-70mm f/2.8L IS USM vs Sony - FE 16-35mm f/2.8 GM II

These two are nearly even on the Mars Score (64.6 vs 62.8). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.

Pick the RF 24-70mm f/2.8L IS USM if you care most about optical stabilization / min focal. The biggest gaps in its favor are optical stabilization, min focal, max focal. The single most decisive one: Has Optical stabilization.

Pick the FE 16-35mm f/2.8 GM II if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight. The single most decisive one: Weight — 353.00 g less. 547 vs 900.

Both ship with comparable weather sealed, 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.