You say the 85 f1.8 Nikon is soft wide open.
Then the 105 f2.5 is too sharp!
I guess the question is; what specifically are you looking to see in a portrait? If that quality is hard to quantify in words or, "you'll know it when you see it", then I think your search may run into diffculties. There may be no specific lens that creates the 'magic' you are looking for. Or at least no lens that will fit your Nikon.
As an aside. Although I have no personal expierence, quite a few people admire the 90mm f2.2 Leitz Thambar. It is apparently unique in it's rendering. They are very thin on the ground and command high prices. They are in LTM and will fit M39 and, with an adapter M mount cameras.
Last edited by pen s; 10-15-2013 at 10:57 AM. Click to view previous post history.