Get the FE 85 1.8 and save yourself $800.
The A7r3 does look fantastic but not enough so for me to trade out of my A7r2.
I use 85mm for almost all my professional work, so it's where I would want to really spoil myself. Not the place to save money. And I tried the 85GM at Sony Square.. incredible.
I doubt I would be tempted to upgrade if I was already an A7rii owner. But the upgrades may be big enough to draw in people like me, who were held back from the A7rii by lots of little things.
Things that I'd appreciate on the A7rii:
- Dual card slots (not a necessity, but I'm used to having it)
- Better battery (The A6300 battery already often annoys me)
- Thumb stick for AF (I HATE moving focus points on the A6300)
-Supposedly just a faster, less laggy and more responsive system.
-8-10 FPS with simulated live view. I don't shoot continuously often, but nice to have that speed when I do. (But would prefer true blackout free VF like A9)
These are the types of little things that kept me away from the A7rii. Saw a CameraStore first impressions video -- They said it well... the A7rii was a great specialization camera -- mostly a great landscape camera. The A7riii upgrades it to more of an all-purpose camera, to truly compete with the D850 and 5Div.