
Before we begin please keep in mind that Hasselblad H5D-50c and Pentax 645z are complete camera unit and Phase One IQ250 is a digital camera back only.
From the image below you can clearly understand the design of Phase one System, the last part is Phase one Back, the middle part is Phase one camera body, the 645DF+ supports more than 50 digital backs including the recently announced IQ250 and 80 lenses (focal plane or leaf shutter lenses), the price of 645DF+ camera body is approx $5990.

Hasselblad H5D-50c vs Phase one IQ250 vs Pentax 645z
Now its time for comparison, we have selected some very basic features that will clearly tell you the difference between these three medium format camera

As we know that all three camera comes with Sony made medium format sensor, the Pentax is able to extract ISO range up to 204800, other two camera ISO limited upto 6400.
The other major feature is presence of advance Phase AF system in Pentax 645Z camera with 27 AF sensors and 25 cross-type sensor.
+1 we forgot to mention that Pentax 645Z is also capable to record Full HD video (1920×1080) and 4K in intervall mode.
Price difference: We really don’t know why Phase one Hasselblad asking for so much money ? on the other hand Pentax is able to give you better core specification at very affordable price. We highly recommend you to wait till April 24th and we will update this post with Pentax pre-order links as soon after the official announcement.
Hasselblad Lenses – H System lens line (12 lenses from 24 to 300mm)
Phase one IQ back mounts Phase One 645DF+, Mamiya 645 FF+, Hasselblad H1 and H2, Hasselblad 555ELD, 553ELX, 503CW and 501CM
Via adapter: Mamiya RZ67 Pro IID, Mamiya RB67, Contax 645 AF
Phase one lenses – 28mm LS f/4.5 Aspherical, 55mm LS f/2.8, 80mm LS f/2.8, 110 mm LS f/2.8, 75-150 mm LS f/4.0-5.6 , 150 mm LS f/3.5, 240 mm LS f/4.5 IF
645z Lenses – 120mm Macro A and AF, 25mm DA, 35mm A, 300mm AF, 400mm AF, 150mm AF, 35mm AF, 150mm-300mm AF, 600mm A.