just a thought, if 85mm and f/1.2 is what you need for field/depth of view, try checking out one of these:
http://www.ebay.com.au/itm/Repro-Nik...item2c630fb122
It doesn't have a real lens mount, just a 52mm thread (so you can construct your own mount maybe including a tripod-ring) with a reversal adapter, or bellows (because it doesn't have a focussing helicoid, i hear the nikon pb4 is good, includes swing-adjustment). Not made for infinity-focussing (same as the mpe-65), and from what I hear, it's sharp as all hell straight from f/1.0. Also, for all that, surprisingly cheaper than the 85 f/1.2L...