There is always one consistent aspect of these types of conversations, they're all train wrecks. They almost never lead to anyone being convinced of anything, people get insulted or feel insulted, the "experts" all come out, and mounds of people get sucked in with no real productivity achieved. I am now part of the mound. lol.
Having used numerous systems over the years, I have found that there is absolute truth to the sayings "horses for courses" or "different strokes for different folks." So long as you are honest and know what you're doing with all of your gear, you will usually find that there are things to love and not love about every system. It is how each of those systems works for you and what you need that really determines which one is best. But to argue over which one is better is almost always an exercise in futility since everyone has different needs and preferences. The only way to know for sure whether something works for you is to get it into your hands and find out for yourself.
As a user both systems (xpro2/xt1 and a7r2), I can honestly say that there are tangible benefits to both. For a long time, I simply loved the process of making images with my Fuji rig. But there were always a few things lacking which I compensated for with my Canon rig. Then came the Sony A7R2 which changed the game for me. It provided a tool that gave me the ability to do lots of things I was never able to do before. However, while it is a tolerable shooting experience, I cannot say that I enjoy the process of making images with it. Along came the xpro2 and now things are starting to get really interesting. IQ is now a toss-up with my preferences being different for differing shooting scenarios. AF is much better on the xpro2 than the xt1. But it is still not up to the level of consistency that I have been getting with the Sony. IBIS is also the real deal for those that like to believe that it isn't (I never thought much of it before using it either). Also, 42mp and all that flexibility in the files is great if you do a lot of post. When I will be in a shooting scenario where I am taking lots of shots, running and gunning, and needing things done on the fly, Fuji is king. When I am trying to get absolute flexibility and maximum data in the files, Sony is it. I could sit here and do this all day with pointing out a list of things that I love and hate about each. But the truth is, they are both tools that give me everything I need when used in conjunction with each other.