The DXOMark labs show that the Canon RF 50mm f1.2L can compete with the rest of the pack.

Canon has always had a knack for making some truly gorgeous 50mm lenses, and perhaps one of their best is the 50mm f1.2L EF Mount lens that has been loved and adored by many since it was introduced back in 2007. Now that Canon has moved into the Mirrorless market, it only made sense for them to release an updated version of this lens with the new RF Mount. The Canon RF 50mm f1.2L has now been tested by the fine people at DXOMark and the results are in.
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https://www.thephoblographer.com/2019/06/14/dxomark-the-new-canon-rf-50mm-f1-2-l-usm-proves-to-be-quite-nifty/