Hello Darr,
I posted this on a different forum, but I think it applies here as well.
The new X1D mark II is hardly technically inferior to any of the 50 MP Fujis, in a smaller, lighter and better looking package with a better UI - in fact, to me is better than both of them, unless you definitely need a focal plane shutter of course. About the Fuji GFX 100, I might be wrong, but IMHO the Fuji GFX 100 is a great technological achievement without a clear target user, save of course the wealthy amateur that wants the latest and best no matter what. Let's see possible professional uses for the GFX 100:
Studio (people). That's probably the best use for it, but then why do you need such a huge camera, or IBIS, or weather sealing in a studio? And, it has a relatively slow flash sync, not a must in the studio but since there are leaf shutter systems out there, probably if you do people going into one of those would be a better choice.
Studio (product). Same as the above, and, no product-shooting-specific lenses such as T/S, limited choice of macro, and so on.
People outside the studio. Again, see studio (people) above, but in this case leaf-shutter systems would definitely much better suited to the task.
Sport. Despite all the advancing in tech, I think that hardly anyone would choose MF as their weapon of choice for sport shooting. No long enough lenses, not fast enough, too many MP to move around, and so on. IMHO, FF is still the king for sport shooting.
Landscape. While it's potentially great to have 100 MP and weather sealing, the 1.2 KG package (camera body alone) makes it a no go for me, and I would never choose it for my work. Now, a 100 MP X2D or a GFX 50R/S-form-factor-camera with a 100 MP sensor would be a total different proposition of course
Macro / flowers. Again, limited macro lens choice and no T/S options would make FF the better choice for this.
Nature / bird / animals. IBIS is useful, but the lack of long enough lenses would limit this use severely. And again, if you have to hike / walk long distances, 1.2 kg for the camera body alone would make this pretty uncomfortable vs, say, FF.
Street. Well, I don't think anyone would consider the GFX 100 for this.
Reportage. I don't think anyone would consider the GFX 100 for this either.
So, if one thinks purpose-oriented, setting GAS aside and forgetting the impulse to have the new and best tech available, I don't actually think that there is any kind of shooting for which the GFX is the best choice out there. The Fuji GFX 100 is technologically speaking a marvel, but it feels more like an exercise than a camera with a clear photographic purpose to me. The X1D II is, as it was the X1D, the best camera for landscape photography IMHO, and while far from being universal (no MF is, yet) is very good at other kind of shooting as well. I might have overlooked something, but I simply cannot see the point of the GFX 100 in practical, real photographical use against the existing alternatives, either FF or MF.
As always, just my .02. Best regards,
Vieri