Tell me...what lens do I use on my APS-C body to get the DoF of an f/1.2 lens on FF? I don't have ready access to the late Stanley Kubrick's Zeiss f/0.7 lenses...
Out of the 100+ lenses in the Canon arsenal, aren't there only 2 with an f/1.2 aperture? This suggests that its a pretty rare specification and, unfortunately, those who need it don't have a lot of options for systems to use. The same could be said for people that need class leading autofocus capabilities. Or thse that need the best 500mm lenses. Or people that need confidence that their camera will still keep working in the dust or rain. The more specialised your requirements, the less choice you have.
But what if you don't need f/1.2, but just want a narrow DOF with nice bokeh? You have many options. (And don't forget you could always use your f/1.2 lens on a crop body.) Sony, Zeiss, Fuji, Sigma etc produce a number of very nice f/1.4 lenses.
Re your question - The SLR Magic Hyperprime LM CINE 50mm T/0.95 must come close.