Guy, I'm extremely familiar using the Nikon 50mm f1.2 Ais and the Nikon Noct 58mm f1.2, on Nikon film and digital SLR's and to be honest, that often times dreamy look that's a hallmark of those lenses, especially when shot at closer range, isn't what one observes when using the VC 35mm f1.2 (Ver II) at f1.2-f2 on the Leica digital rangefinders. I wouldn't personally characterize the 35mm f1.2 as dreamy at these more open apertures at closer range, but as Barry pointed out, of much lower contrast as opposed to stopping down although it has a very organic feel to its images.
Yes, the OOF background of course is diffuse when shot wide open but more in a slightly gritty way and quite different than the two Nikon's look. Shot wide open at longer distance range, it's resolution drops off precipitously across the frame, especially at the edges and so when used wide open till close to f2, I'd use the VC lens at mid and close range. I have to be honest and as lovely as a VC 35mm f1.2 lens is, I'm not 100% certain it's exactly what you're looking for, knowing somewhat your past likes and dislikes.
Again what all these lenses look like when compared to one another on the Sony's, may be somewhat different as opposed to when the Nikon's are used on Nikon bodies and the VC 35mm f1.2 on a Leica digital rangefinder, so I'm basing my observations using these lenses on their native systems.
P.S. In many ways this thread is keeping with the spirit of the excellent review of the Sony zoom by Tim. Since that zoom seems to have compromises, the discussion has in some ways has naturally turned to alternative single focal length lenses within the zoom's range and which of these lenses have distinct advantages.
Dave (D&A)