I had access to an A7 at an old job. I had issues with my Canon 70D and was looking at upgrading to a 6D; since I would have to sell my APS-C lenses anyway, I figured if I was going to switch to mirrorless, that was the best time.
I didn't like the A7. The handling didn't feel as fluid as the X-T1, I personally didn't really like the menus or button layout, and the lens selection wasn't nearly as fleshed out at the time.
Now I feel pretty much the same. Fuji's lenses aren't cheap, but I think they're good value for money; a lot of Sony lenses seem to be either a cheaper lens that are just decent, or very good lenses that are big and expensive.
I don't think the full frame argument holds that much weight these days (resolution is another matter, however). Shooting the Fuji 56mm at f/1.2 vs the Batis 85mm at f/1.8 will yield similar results, and the extra stop of light from the 56mm helps negate the Sony's better low light performance. The GM 85 1.4 will trump the 56mm, but you're looking at double the price, double the size, and double the weight.
If your goal is purely the best image quality possible, an A7Rii with G Master lenses will beat Fuji. When you factor in the entire experience (performance, size/weight, and cost) I think they're pretty evenly matched, and you should use each and figure out which system you enjoy more.
