Then, what I can say (beyond the fact that Hasselblad batteries apparently do not crap out after a year, since the one I use are a few years old...) is that you will not test the camera only. The software is just as important, especially for tethered use. Hasselblad uses Phocus, which is somewhat confusing at first, but allows a very powerful and efficient workflow. Phase One uses Capture One, which I don't know but has a good reputation. Try to attend to an afternoon demo of each one if you want to make an opinion on the two camera systems.
As I said, my opinion of the Hasselblad system is generally positive. For my needs, there is little it cannot do. There are very few frustrations or omissions in the overall system (camera, lenses, adapters, etc...). I can see that the workflow is designed for the needs of pro photographers (i.e. mainly portrait/fashion and product photography). Obviously, it lacks the conveniences of a 35mm system (e.g. highest iso, fast AF or 16-35 and 70-200 zoom...), but you should already know that. Probably the biggest annoyance for a pro is that all repairs happen in Sweden, so if your camera break it will take 3 weeks to be repaired, but I am not sure that Phase One... or Canon are much better here.
As to the workflow... Let me give you examples:
Landscape: the 28mm lens is excellent and the leaf shutter means you only need a relatively light tripod. OTOH, checking focus is difficult on my camera (but is easier on the H5D which has a better screen).
Architecture: not really a strong point if you need movements. The HTS is not the best choice. The backs can be used on a technical camera with an adapter with battery though.
Product: very good. The 120mm macro lens is very good (and the new version even better). The HTS is well adapted to that use, particularly with the 80mm or 50mm-II and macro adapter. Shooting tethered with Phocus is very good once you are used to the interface. You can focus using a surprisingly usable sort of live view.
Portrait/fashion: the cameras produce very pleasant skin colours and the lenses, especially the 100mm, 120, 150 and 210 have very nice bokeh and in-focus to out of focus transitions. The leaf shutter allows your flash to overpower the sun (if you have a fast flash, cheap strobe heads won't do).
As I said, I am pretty sure that the competition makes good cameras as well, and people using them will probably chime in. It is a question of what you need and what you want. For example: I tried a Sinar back as well. Compared to the Hasselblad, I found very convenient that it had its own battery inside, and that it could deliver jpegs. Its screen was much better and faster as well (but my Hasselblad back is old, newer are better on that point). OTOH, Sinar software could only control the back and not the camera at all and that is a big advantage of Phocus.
