Take all of this with a grain of salt, because I haven't written the check yet, but last week we were at an LA dealer buying lighting and grip and I spent about 45 minutes playing around with a h4d40 and a leaf credo back on a phase camera.
This is non scientific not on set testing, just playing around with kinos and these two cameras.
Now, FWIW, my experience comes with a lot of years using my Contaxi and Leaf, Phase backs.
The DF was a much better camera than I previously thought, felt good, easier to hold than the hasselblad and the autofocus was fast and equal to the hasselblad, though I could manually focus the hasselblad with 90% accuracy, not so easy with the DF. The DF was kind of like a Canon viewfinder where it looks in focus but not exactly tack sharp. Once again the DF and Hasselblad autofocus is fast and accurate, compared to my contax and p30 much faster, but not more accurate.
The Hasselblad is more compact, and though I'm not overwhelmed by the grip, the camera fits in the hand well (at least my hand) and overall seems more refined than the df with a much better viewfinder.
The one thing I don't like about the blad is the amazing noise of the mirror slap. I know it can be put on a electronic lag where it effects the file less, but what a noise.
Using a Kino led with diffusion, I noticed the hasselblad 40 was about 1/2 to 2/3 of a stop brighter than the df with the leaf credo 40. Now I didn't put any files in a computer, so I don't know if it was or wasn't the brightness of the lcds, but the hasselblad seemed have higher equal iso.
I liked the Leaf's interface, the hasselblad interface seemed on generation old but worked well. The lcd's to me were a wash as the credo had more detail, but since both didn't employ noise reduction on the preview files both were very noisy and grainy, so to me the previews on both cameras are equal.
Now the real truth is writing the check. Overall I like the Hasselblad body better, the ex kodak sensor better than the Leaf, though the Leaf back has a great interface, really well thought out.
When time permits, I'll rent both systems and use them on set in production, go through the complete workflow and then decide, because the only truth in any of these posts is if you actually buy.
BTW: I love the white/black look of the h5d. That shouldn't matter, but I love the look of the camera.