Well, I can understand that people prefer the FE 90mm F/2.8 Macro G OSS over the Batis 1.8/85 because it has macro capabilities and a shorter MFD. But I don't get the argument "it is sharper" since I haven't seen any proof of that. To me, the strongest point of the FE 90mm F/2.8 Macro G OSS is the macro feature and its secondary function (not its strongest point) is that it can act as a portrait lens. Even if people don't care about the bokeh, the difference is still 1 stop and 1/3 which is a lot. While ISO400 may not be noisy at all, I would still prefer ISO160 over ISO400 if I could live with the limited DOF that F/1.8 brings with it. And then there's also the Zeiss rendering. So as a portrait lens, the Batis 1.8/85 is the clear winner to me.
Remember that you went for the A7II at first and finally ended up with the A7RII? Save yourself some trouble and stick to the original plan (read: get the Batis 1.8/85).
Sharpness is probably last on the list of priorities when it comes to evaluating a portrait lens. It's important to a point, but flattering rendering of skin tones is probably the most important criteria. In this regard, the FE 90mm actually does surprisingly well and is reminiscent of the way Canon L primes render (which is a good thing). This is also the area where I was never fully happy with the Sigma ART primes as portrait lenses, regardless of how utterly sharp the 35A and 50A are.
The bigger consideration is f1.8 vs f2.8, for creative purposes. For the controlled portrait shooting you'd typically be doing with a medium telephoto, very rarely will you be put in such low light that 1 1/3 stop of light gathering will make or break a shot, so its more of a stylistic preference than anything.
So it comes down to MFD flexibility vs aperture flexibility. If stylistically f2.8 is a large enough aperture, then its worth considering the FE90 for the ability to move closer and add some macro capability to your kit. (detail shots for weddings/events)
I have a few more days with the FE90 and am still high on the pre-order list for the batis. I'm undecided at this point, but the FE90mm is a lot of fun
