The 24x65mm format does make the XPan a specialty item, as noted made more conventional when using the 24x36mm option. And the XPan is a really nice solution when you want to go after panos while using 35mm film.
The Bronica 645 would be more general-purpose, more flexible, and offers panoramas as well... just crop the 41.5x56mm frame to the same proportions, or whatever proportions fit your particular subject. A 21x56mm crop would get you the same proportions as the XPan. Further, this 21mm strip can be anywhere in the 41.5mm frame; top, middle, bottom... so you can get some lens rise & fall effect for perspective control. The other differences are in using 120/220 film instead of 35, the camera is taller, and there's no 30mm lens.
Of course you could do the same proportions with the Hexar AF, but the crop would be to about 13x36mm; quite a lot smaller.