Apparently the Nikon mount is unable to support f1.2 lenses. In the interest of designing Sigma lenses that can support multiple lens mounts, I can see why Sigma would never release an f1.2 lens.
That said, having owned several f1.2 lenses, the difference between f1.4 and f1.2 is negligible. People get more caught up in the f number, than the actual real world impact. I'll take an optically superior, yet cheaper, 1.4 lens over an f1.2 lens any day of the week.
My thoughts exactly.
For you it matters, but it doesn't for me, and i will expect it will be large anyway, sometimes you can't have everything at once, so i can sacrifice weight and size for performance as f/1.2 and fast AF if possible.
If anything I hope they make an FE/A mount over 1.2. The 1.2 is over-hyped of the 85L to begin with. Give me tack sharp at 1.4 and im a happy camper. The iso performance of these cameras are good enough as it is. If you need to just down size the image file.