While I'd love a new X1D, (we all love the latest toys
... for the applications you specifically mention the H5D would be my choice.
First, and perhaps foremost, the H5 features True-Focus v2. I cannot over emphasize how well TF works, even when focussing and recomposing a subject at the very edge of the frame. AF is also fast for MFD.
The H5 has the brightest viewfinder I've used to date. When I had a H4D and my current Leica S with its highly touted bright viewfinder, I mounted the same H lenses on both cameras and the H viewfinder was visibly brighter. Not sure if the H to S adapter played a role in that, but it was clearly brighter. After a lot of experience with EVF on my A7R and A&R-II, I still do not like it compared to optical VF. I even had a chance to look through a Leica SL with the highest spec EVF available, and I STILL disliked it.
The already excellent ergonomics of the H4 was improved on the H5. With a hand strap, the H is easy to use for periods of time than one would not expect from a larger camera compared to the X1D.
The H system is a product of a decade+ of refinement ... it is a known entity.
Full range of lenses ... the less mentioned HC-210/4 is a staple for fashion and portraiture, and the HC-100/2.2 a prime reason to go H. The new 50/3.5 MK-II is a state-of-the-art optic second to none.
While the new H6 allows use of the new 1/2000 sync leaf-shutter H lenses, the 1/800 versions are available used at extremely reasonable pricing. I wonder if Hasselblad will offer a firmware update for the H5 to allow use of the 1/2000 lenses. I can't imagine them continuing the manufacture of the 1/800 versions.
You can detach the H5 back and attach a battery for use on a camera with movements ... I loved doing portraits with movements to control the areas in and out of focus.
- Marc