OM System - OM-1 Mark II vs Sony - α9 III

The α9 III edges ahead on the Mars Score (42.8 vs 46), but the 3.2-point gap is small enough that the right pick comes down to which spec advantages matter to you.

Pick the OM-1 Mark II if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are weight, af points.

Pick the α9 III if you care most about megapixels and sensor size. Its strongest claims are megapixels, sensor size, max video.

Both ship with comparable in-body stabilization, log profile, 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.