I looked at all the options and as of today the H6D 100c seems to be the "cheapest" "real" MF camera.
I don't know where you are located, and both currency and specials/bundles etc can change the math a bit here or there, but once you account for the fact the Phase One XF IQ kits come with a lens and the H6D does not the list prices here in the USA:
Those prices are for new-condition kits. Notably there is a
sale on Phsae One Certiified Pre-Owned kits (20% off the normal CPO pricing) with standard warranty.
Some of the features the XF has the H6 does not:
- Built-in Profoto Air transmitter
- Built-in Profoto TTL
- Built-in Profoto Air Manual Control
- Built-in Focus Trim tool for auto lens calibration
- Flash duration meter
- Vibration analysis during capture
- Vibration-drive for delaying capture until vibration has subsided
- Automatic Focus Stacking
- Icon control for putting only the tools on screen you need
- Bright, modern LCD
- Metering while using a Waist Level Finder
- Time lapse capture, including metadata tags integrated to C1
- Exposure bracketing, including metadata tags integrated to C1
- Upward-facing bulls-eye level
- Hyperfocal focus setting
- Touch screen interface (with optional hard buttons for when you're wearing non-touch gloves)
Some of the features the IQ has the H6D does not:
- 3-axis level that integrates with C1 for automatic control of horizon and perspective
- Adjustable highlight warning point
- IIQ-S slightly-lossy compressed format (the difference between this and lossless compression is extremely hard to see even when you push the file around and know where to look) in addition to the lossless IIQ-L format
- Histogram without blocking the view of the overall image
- blinkies in the thumbnail without obfiscating the main image
The Phase One system is also directly integrated with Capture One. The H6D is not and will not be supported in Capture One.
I'd suggest as part of your purchase research to look at the last 5-8 years of product releases and feature improvements and take note of what both Hasselblad and Phase One have been up to in that period. When were the lenses in the current lineup released? What new investments have they shown in their respective 645-sized bodies? What new features have they released on their bodies, backs, and software? Where is their focus and attention?
Of course, I'm wildly biased (we choose to sell P1 and choose not to sell Hassy) so you should consult with a Hasselblad dealer on the unique features and arguments in favor of the H6 platform. My main point is only that you should definitely include checking out a P1 while you're checking out a Hassy. Even if you were leaning toward the Hassy I'd tell you the same thing. Either way it's going to be a large investment, so it's only sensible to put your hands on both before you go with either.