Is a full frame f1.2 lens totally impractical?
Yes
Do I still want one?
Also yes
@jerry Would that happen to be the Canon RF 1.2L?
@jonathan I have a Nikon z9, so looking at the z 85mmf1.2s
@jerry Nice! I like my Sigma 85 for my Sony. It's great for portraits. Just picked up a small 35mm 1.8 and it was so nice for walking around.

@jonathan @jerry I have the EF (50 mm) version. Fantastic lens.

Nikon is for, well, you know what you are.