DxOMark tested the Canon RF 50mm f/1.2L lens for the EOS R mirrorless system.

The Canon RF 50mm f/1.2L is a remarkable lens, made to showcase the capabilities of the RF mount. DxOMark gave it a score of 38. This score puts the Canon RF 50mm f/1.2L among the top five 50mm lenses in DxOMark’s rating. However, it’s clearly below the score of lenses that costs much less, e.g. the Sigma 50mm f/1.4 DG HSM and the Zeiss Milvus 50mm f/1.4 (both not f/1.2).

From DxOMark‘s conclusion:

There isn’t a huge pool of f/1.2 50mm lens to compare the Canon RF 50mm f/1.2L USM against, and most of its competitors have a maximum aperture of f/1.4 or f/1.8. If optimum image quality is your major concern, then the Sigma 50mm F1.4 DG HSM A makes for a better choice, although it can’t be mounted directly on Canon’s mirrorless cameras. However, if you need the extra 1/3-stop of light, then the RF lens makes a good solid proposition that is a step up from the older Canon EF 50mm f/1.2L USM.

Canon RF lenses: [shoplist 52325]

Canon EOS R full frame mirrorless system: [shoplist 52287]