I didn't preorder, but I walked into my local store today at lunch and bought one. Potentially going to replace my 50/1.8S and my 50/1.2 GM with it, since I really can't justify the cost of owning the GM since I'm shooting far fewer portraits and such that would require such quality, and I have the Voigtlander 50/2 APO-Lanthar for daily carry in a small package with impeccable image quality. This would be used for casual portraits / candids with AF.
I've barely shot with it, but so far it seems to be decent. (Edit...I've taken a few more test shots, and I'll amend that....so far it seems to be quite good). Some of the same classic rendering, with softness to the edges close up, but not as bad as the 35/1.4 was. It's also sharp at the edges by f/4 near MFD (the 35/1.4 never got sharp near MFD). Bokeh, while not perfect, definitely seems nicer than the 35/1.4 in my initial shots. There is longitudinal CA.
Sharpness looks actually quite decent once you get away from MFD...beginning at typical distance you'd shoot people. Some residual spherical aberrations for sure at wide apertures, but nothing insane. Sharpness and contrast increase quite a bit at f/2, but there is fairly good resolution even in the corners wide open when you're not focused super close up. By f/2.8, it's pretty much tack sharp corner to corner, at least on the 24MP Zf. I haven't shot it yet on the Z8, and won't be able to until this evening.
Overall, I think it looks like a better lens than the 35/1.4 and while it definitely isn't quite as sharp as the 50/1.8S at wide apertures, it's good enough that I think it's a really nice option. I'll obviously have to shoot a lot more with it, but I think my plan will work out well, and I'll just keep this and the CV 50/2 AL.
Edit: After a few more test shots, I'm actually coming away fairly impressed. It seems a fairly strong step up from something like the old Canon EF 50mm f/1.4 (I've never shot with the Nikon F mount versions). It's more of a classic rendering than the S line lenses, but seems to have a nicer rendering and a bit more sharpness than a lot of older glass. Only real weaknesses seem to be edge sharpness near MFD at wide apertures, and longitudinal CA. Looking forward to shooting more.