I\'ve had them all - and all are excellent or at least very good in terms of sharpness.
IMHO, at f2.8 in order of sharpness: 105VR, 180, 105DC, then 135DC. I found the 105VR slightly sharper, while the 180 and 105DC are pretty close to one another. The 135DC isn\'t that far behind. That being said however, I think both DCs and 180 have a more pleasing bokeh than the 105VR. Also note, both DCs provide an extra stop for even better subject isolation, as well as defocus control (if you want to take the time to learn how to use it.)
I still have the 105DC and 180 in my bag (although I think the 180 maybe leaving since acquiring a 200/F2). Oh, and I also share your thoughts about the 85 1.4 - just too close on FF.
