And it gets better..Steelspring and Techart are both bringing out smart adapters for Canon glass. These will provide accurate, if slightly slow AF on all Canon lenses. Imagine a 135 f2 on this camera with accurate autofocus...That is when you will truly see the medium format look for full body shots ( it will probably be too thin a depth of field for portraits, but fun to focus on that eyeball and watch everything else vanish into glorious bokeh balls ). Kipon also have something in the works in this area and are apparently working with Fuji on some special features, so the smart adapter scene is looking very exciting.
So the GFX so far has been stellar for me, I've used it on commercial shoots and all my work with models. But..I also shoot weddings, and the D850 has been mighty tempting. I could sell the GFX and the two lenses, get a D850 and a few primes, and have about £3000 to spare. However, although the D850 is amazing ( might still get one! ) I can't leave behind the GFX. There are a number of reasons for this...
1. I enjoy using it. That is the number 1, most important thing about this camera. I've grown to love the Fuji ergonomics and shooting experience and the GFX is just an extension of that. Moving from my xpro-2 or x100F to this camera is very easy. All modern cameras are amazing, the D850 smokes the GFX on specs but I know for a fact I would not enjoy using it, it would just be a tool to get the job done.
2.The Fuji lenses - I have used a lot of Nikon and Canon glass ( G.A.S = system switcher ). None of it comes close to the Fuji GFX lenses for me. You buy into a system for the glass, not the camera body and the Fuji glass is stellar.
3. The EVF. I'm so used to using an EVF, I'm not sure I can go back to the DSLR world.
So thats the D850, what about the Sony A9...This camera has seriously tempted me for my wedding work and I believe its a great all rounder as well.
1.It's so damn expensive.
2.Sony ergonomics just do not appeal to me. And the fact that by this time next year the next Sony A9 iteration will be out, while Fuji will still be supplying firmware updates to radically improve the GFX.
The A9 and the D850 are both amazing cameras and if I already owned lenses from those manufacturers I'd go for it, but I don't so I won't:) There is always a better camera around the corner so I'd just go with what you enjoy shooting, and for me thats the GFX ( and my X system cameras of course, for anything that moves!).