Is a full frame f1.2 lens totally impractical?
Yes
Do I still want one?
Also yes
@jerry ahhhhh. do it!

I've got a sigma f/1.4 fullframe that I got ages ago for my 5dm2, and it's doing wonders on my 6dm2.

having a 1.2 would be crazy! albeit limited use cases
@thegpfury β€œfor when you only need the tip of the cornea to be in focus, trust the f1.2”
@thegpfury also, stopping down a bit to f1.8 would probably make for some glorious pictures
@jerry For sure! in another life I used it a lot at 2 for weddings, and got some dreamy photos.