This lens is an impressive performer and a member of my personal kit. Here are some comparisons:
Here is a Canon EOS R5 vs. Canon EOS R resolution and sharpness comparison.
The Canon RF 50mm F1.2 L USM Lens compared to the Canon RF 50mm F1.8 STM Lens? Again, the F1.2 lens takes the wide open win. The price difference? No contest.
The Canon RF 50mm F1.2 L USM Lens compared to the Sigma 50mm f/1.4 DG HSM Art Lens at f/1.4? The Sigma lens puts up a good fight in the center of the frame, but the Canon lens rules the mid and peripheral areas of the frame.
What is your guess for the outcome of the Canon RF 50mm F1.2 L USM Lens vs. Zeiss Otus 55mm f/1.4 Lens matchup at f/1.4? I'll give the Canon lens the win in the center of the frame and the periphery appears to be a draw. The price difference combined with the AF difference? No contest for most.