[Brightcolours]

An obvious lens to compare this new Nikkor Z 50mm f1.2 S with is the Canon RF 50mm f1.2 L USM.
The Nikkor is a bit heavier (1090g vs 950g), and is a tad more complex with 2 more elements (17 vs 15). The Nikkor is considerably bigger (150mm vs 108mm).
Nikkor lens construction:
https://chsvll.nikon-image.com/products/...pic_02.png

Canon lens construction:
https://cweb.canon.jp/eos/rf/lineup/rf50...uction.png

Very different lens designs, resulting in a longer front heavy Nikkor, with big front elements in comparison. I wonder if the difference in design philosophy results in less vignetting in images with the new Nikkor?

Nikkor MTF:
https://chsvll.nikon-image.com/products/...pic_01.png

Canon MTF:
https://cweb.canon.jp/eos/rf/lineup/rf50...ec-mtf.png

If I read them correctly, the Nikkor is as sharp or even a tad sharper wide open as/than the Canon, so a very good lens (see Klaus' review of the Canon lens), and a bit more contrasty.
MFD also comparable (45cm with 0.15x magnification for the new Nikkor, 40cm with 0.19x magnification for the Canon).

The new Nikkor undercuts Canon's price: MSRP for the US $2100 according to dpreview ($2299 for the Canon).