Re the Z7 - it does. It is of course a stunning camera. Your work, along with that of Nigel Danson for example, is more than proof of that. Unlike the Sonys I owned, it's a lovely thing to use too but as a long-time Nikon shooter, I still gravitate back to my old D700.
A completely different beast from another era, but to use a car analogy, it's akin to driving a 427 Shelby Cobra whilst the Z7 is an Aventador SV. The D700 won't be anywhere near the landscape tool the Z7 is, but for almost everything else I love its output - it's a more forgiving camera too. It wouldn't be my carry-around though, being far too big and massively heavy, plus the shutter is so damn loud.
A friend of ours is moving over to GFX, slimming down his X collection, so let go of his old X-Pro1 and XF35-1.4 for a good price so I could dip my toe back into the Fuji system. I could either re-build (along with something like an X-T2) a small Fuji rig - with our eldest getting more and more involved with rowing, I'm after some long glass so that would have to be considered. 100-400 is a possibility. A 16 f2.8 and 50-f2 would finish that off.
Or...
Get the Nikon 200-500 for the D700 purely for days out on/near the river and have a couple of small primes in my pocket for the X-Pro1.
<basically, I haven't got a bloody clue>