Canon - RF 50mm f/1.2L USM vs Sony - FE 135mm f/1.8 GM

The FE 135mm f/1.8 GM is the clear pick on raw spec strength, leading by 14.8 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.

The RF 50mm f/1.2L USM doesn't pull ahead on any single popular-comparison spec — its strengths sit in the spec table groups rather than the headline advantages.

Pick the FE 135mm f/1.8 GM if you care most about min focal and max focal. Its strongest claims are min focal, max focal.

Both ship with comparable weight, weather sealed, optical stabilization, so those specs don't separate the two — focus on the differences below.

Bottom line: the FE 135mm f/1.8 GM is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.