The 15/4.5 E-mount became just available again but has the same copy variation problem. Voigtländer doesn't admit they have a problem, according to this email from them. Voigtlander 15/4.5 III E-mount Rolling review - FM Forums
So, getting a good one will continue to be a crap shoot. No thanks at this time.
I am using Choppy on my TechArt Pro autofocus adapter that also enters the focal length into the Exif. I can live with that and have AF and 5-axis IBIS image stabilization. Techart PRO AF adapter now In Stock at B&H Photo - FM Forums
I really like as well my E-Mount 10/5.6. Here AF is not important, simply set focus to infinity, aperture to f/9, and shoot to get a sharp image pretty much almost into the corners. F/8 or f/9 seems to be the sweet spot, slightly improving the corners over f/5.6. I am using f/9 or f/11 a lot for increased DoF.