I've owned the Hasselblad H1 & H2 with P45+ on it, and tested at length the Phase/Mamiya with P45+ and I'm currently testing the Leaf AFI 7 - 33MP.
Some of MY candid impressions:
Hasselblad:
Hands down the best camera/user definable controls - in camera user definable attributes.
Camera body - fit me great and carried well on a strap when hiking.
Lenses: Decent glass but not up to what I was used to with Schneider/Rodenstock on my 4x5 or even as good as I was getting with CFi lenses on my 503cw with P45, but close.
Sensor - can't say as I only used Phase P45 and P45+ on H1 & H2 respectively - need to check it out in the future but inability to put back on a Technical camera will probably preclude need to test it.
RAW software - used ACR for all of my work so I can't say about Hasselblads RAW developer.
Back is not oriented to being used on a Technical camera. Saw a ridiculous contraption that allowed it but it was more of a joke than useful for anyone doing field work.
Pricing: Best for the buck at the moment.
Why would I buy: Great camera, but closed system would deter me. Wish when they dropped prices they had said system will be opened up again. If they had, I'd have a hard time saying no.
Phase:
Camera user definable controls - not impressed at all. Hasselblad way ahead on this one.
Camera body - do not like - nothing in the right place for my size hands and the placement of the camera straps require that the camera/lens be carried in a horizontal format when on your shoulder. No hot shoe, etc.
Lenses: Adequate, but not overly impressed. In testing the new WA, I found the corners too soft for my taste, or the price they ask for it. The 150 tests were excellent.
RAW software - as good as it gets! Extremely well designed compared to competitions.
Back can be used on Technical Camera - a real plus!
Pricing: Needs to catch up to Hasselblad.
Would I buy: Great support, excellent array, wrong camera body to my taste and Leaf glass is frankly better in all of the tests I've run to date - will be running more this week.
Leaf:
Camera user definable controls: Not impressed.
Schneider glass - test are blowing away the Phase/Mamiya glass. Considering it's a 33MP array, it's more than making up for the lack of MP in the quality of images from the lens!
Camera body - feels as good as the Hasselblad H, which is perfect for me. Some concern that the AE and AF settings button could be moved inadvertently. Needs far more user definable controls and presets.
RAW software - they should be embarrassed.
Back can be used on a Technical Camera - a real plus!
Pricing: Needs to catch up to Hasselblad and get in line with, or beat Phase.
Would I buy: Love the glass, like the camera body, software is beyond poor, open system - will depend on rest of this weeks testing results AND what Leaf does to get their pricing in line with Hasselblad/Phase. Currently you can buy a Phase with body, lens and 39MP back for considerable less than the Leaf with 33MP back. This is not even considering what Hasselblad did at Photokina on pricing!
Thus, the ideal camera for me and my landscape work is the Hasselblad camera body, Leaf Schneider lenses, Phase RAW processor. As to back, need more testing to define Phase or Leaf - right now leaning to Leaf - greens on foliage look real good and would probably look a lot better if I could develop in Phase's Capture 4 software!
Offerred in the spirit of sharing. Please remember, I do landscape work, not studio, portraits, products, etc. These areas of need could dramatically alter the above, but their needs are not my concern in my evaluations.