I bought and used both the FE and G.M 85mm lenses for a while.
I bought the f/1.8 as a stop gap while I decided between the Sigma Art and G.M f/1.4 lenses. The FE85 is an extremely good lens. It has very fast focusing for an 85mm, weighs next to nothing and in all was just a really easy and nice lens to use. It also has the button than can be remapped to eye a.f which is handy.
Later on I got the 85MM G.M after deciding that the Sigma Art was too cumbersome for my preference.
The FE85 is just as sharp as the G.M but the bokeh from it isn't as nice. I ended up selling the FE85 although I kind of regret doing so but it was hard to justify having both along with the 90mm Macro. I preferred both the FE85 and the G.M to previous Nikon fit 85mm lenses I have had before which included the 85mm f/1.8D, 85mm f/1.8G, 85mm f/1.4D, Sigma 85mm f/1.4 and the 85mm f/1.4G. The Sony 85mm's are much better than the Nikon versions I have owned previously. Although the Z mount version might be great when it eventually arrives but I wouldn't expect to see that in the near future.
Between the 2 Sony 85mm's it is going to be a choice between the quicker a.f of the FE85 or the nicer bokeh of the G.M. The G.M probably isn't worth the additional cost but that is usually the case between f/1.8 & f/1.4 lenses. Then again the FE isn't much good at f/1.4.