To step back, and compare the new mirrorless MF contenders:
- The Hasselblad is likely to be available 3-6m sooner, but it is more expensive (25%?) will have fewer lenses available at least over the first year and/but they will (have to) have built-in shutters.
- It is more compact than the Fuji, but the latter has a more versatile viewing system.
- There are some indications that the Hasselblad firmware is immature. The state of the Fuji firmware is unknown, but they have a track record of providing firmware enhancements.
- There are some signs that Fuji aims to provide a complete MF system, over time. The Hasselblad seems more tentative. If it sells, they may offer more. (Cf, Leica SL).
- The Hasselblad seems to have licensed Nikon's flash protocols, so their speed light can be used in addition to studio lights.
In headline summary, the Fuji seems aimed more at the photographic journeyman, a professional tool, where as the Hasselblad is aimed more at the lifestyle market.
This is just the impression from advance marketing. It may well turn out that there are showstoppers in either case, when these cameras are used real life, but I'd be interested in the views particularly of those that have seen / used the cameras.