I am continuing to work with the GFX100sII. I primarily intend to use it as a studio and on-location camera.
The good news is that while shooting tethered, the camera charges through the tethering cable that is attached to the computer, so the battery is fully charged even after 8 hours of shooting. The the D810, tethering was really hard on battery life.
On the flip side, the D810 had no issues focusing on the glassware I am shooting, but it seems to confuse the Fuji. Fortunately with the focus indicators and manual focusing, this is not really an issue.
I seem to have no issues tethering to Capture One and Fuji's own Fujifilm X Acquire software, but getting Lightroom to work (requires a Fuji plugin that I have). No luck so far... These are all using a USB cable. Apparently I can tether wirelessly as well, but I have not got that to work yet either.