Canon - RF 24-70mm f/2.8L IS USM vs Sigma - 24-70mm f/2.8 DG DN II Art

These two are evenly matched on the broad strokes, with the decision sitting on which individual spec advantages weigh more for your use.

Pick the RF 24-70mm f/2.8L IS USM if you care most about optical stabilization. The biggest gaps in its favor are optical stabilization.

Pick the 24-70mm f/2.8 DG DN II Art if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight.

Both ship with comparable min focal, max focal, weather sealed, so those specs don't 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 tells you both are well-rounded; the differences are about trade-offs, not quality.