I tried the 135 and the 105DC lenses.
I am FX too and went for the 105 in the end, both are f2 both have the Dc and without it is as sharp as a razor, as you would expect.
The 85 1.4 is a different animal, and probably a good gig lens - but with the D3, I can make do without that extra opening and just crank up the ISO to 400 instead.
The 105 was my choice because it actually provided a "nicer" result than the 135, and is handier in a tighter corner. I have the 70-200, so I can go longer wiht that.
The DC is absolutely brilliant. You can keep it turned off, in which case you have an f2 prime, same as any other. Use the DC to throw the background out of focus and you get lovely softened highlights, it also alters the plane from focus to out of focus, so you do need ot focus after you have set the DC.
Rule of thumb, set the DC aperture to the same as your working aperture. I have played wiht more DC aperture, and it just strengthens the softening, you can overdo it. One stop extra is not too much, but two stops of DC then becomes obviou, a bit like a 1970s softened image.
I have used the effect successfully to replicate an old camera when doing some classic bikes the other day - we wanted them to be "period" pictures too, and they looked like they were taken with an old camera/lens.
Very happy and it is built like it was hewn out of granite. A glorious, specialist, portait lens. If you ain't doing portraits, then there are better lenses for genral photography - the 85 f1.4 for a start, despite the difference in length.
i wouldn't compare the micro 105 with the DC - totally different optical designs. The micro is optimised for close work, and is very nice for general work. The DC excels at portraits, as was intended. At £800 I think it is excellent value - a lens that will withstand marches in time.