Correct, it is presumably a military school. No idea if the building behind is connected. It's an ugly building but those apartments would have a superb view over Guanabara Bay.
That's very true. Although I just want one as an obscure object of desire, not to use it. In the same way people buy classic cars, to own the car they couldn't afford as a kid.
Just viewing this on my laptop it looks nicely detailed, despite being just a 20MP crop. The 100RF is an intriguing camera, but for me, I think the 35mm lens is a bit too wide and I'd have to be cropping in most of the time for the things I like to shoot, which sort of defeats the point of the 102MP sensor, although, in a way, they're using all of that base resolution to provide a quasi 28-80mm zoom without the bulk or weight and, as you've demonstrated here, still be capable of good images at the long end.
I think the lack of IS would put me off too. My GFX100S has IBIS, but even with that camera I don't think it's possible to consistently get all of the detail possible from the sensor at base ISO and typical shutter speeds (<1/100th with the chunky 45-100mm lens) without using a tripod, so if I'm planning to go handheld I'll switch over to the Z8 without any perceivable detail drop (compared to the GFX handheld).
I bought my GFX100S kit second hand despite already having a growing Z series kit at the time and I don't regret the outlay. Under ideal conditions there's a tangible increase in detail levels which can be quite addictive and opens the potential for some huge prints. I don't see much difference in terms of DR between the GFX100S and Z8, sure it's measurable, but in practical terms it's insignificant for the most part.
What I see as the main drawback of the GFX system is the size, weight and range of the lenses. None of the GF zooms I have cover more than a 2:1 ratio, while your standard 24-70 is approaching 3:1, this actually makes quite a difference as you need a 32-64 and a 45-100 to completely cover just that range. Both of those lenses are heavy and carried together are a pretty bulky proposition, becoming even worse if you want to throw in a wide or telephoto too. My usual compromise is to carry just the 20-35 and 45-100 as this covers most of what I do with that camera.
The other issue, as I've said elsewhere, is that in order to get that perceivable detail boost over the Z8, I feel I really need to be using a tripod for the GFX, which increases the weight and bulk even more.
I think each system has its place and I'm lucky enough to be able to use either as I think is appropriate for my purposes. I enjoy roaming the more hilly locations with the Nikon kit and also enjoy the more involved process of using the GFX kit on a tripod when pottering around in the woods.