John, I've not been able to handle one at all. I've had friends , I trust and do have the lens, and dealers looking for one without success. Prices seem to have dropped a bit, or at least stabilized. At this moment I am still deciding between the Leica 135 f3.4 and Batis 135 f2.8. The Nikon 105 f1.4E is calling to me, and cheaper than either of the others, but just heavier than I want to go for the Df. If I were still shooting the D750 .... I've recently seen some D810, 105 E images shot at f1.4 at ISO 64 that increased the NAS.
Sorry I did not see your post earlier.
Cheers,
Tom