Earlier this year, Canon announced its first full-frame mirrorless camera, the EOS R, whose new RF mount features a large 54mm diameter and a shorter flange distance than the EF DSLR mount. According to Canon, this mount will allow for “faster and lighter lenses with higher performing optics” than ever before.

The RF 50mm f/1.2 was one of four launch-day lenses along with the RF 24-105mm f/4, RF 35mm f/1.8 macro, and the RF 28-70mm f/2. In this particular comparison, we’ve pitted it against two existing fast-aperture 50mm primes for the EF mount, the EF 50mm 1.2 and the Sigma 50mm 1.4 Art, both of which can be used on the EOS R with full compatibility thanks to the EF-EOS R adapter.
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https://mirrorlesscomparison.com/rf-mount-lenses/canon-rf-50mm-1-2-vs-ef-50mm-1-2-vs-sigma-50mm-1-4-art/