ArcBody experience
I own and have used both the Flex and Arc, with a real bias toward the latter. I tried both before purchase and chose initially the Arc. Since then I have purchased the Flex, too, but I use it less. These two interesting offerings, from the former version of Hasselblad, Inc., are true examples of the ingenuity that once existed at Hasselblad.
I prefer the Arc over the Flex because of the aforementioned coverage and since I prefer to use wide lenses for most applications. The use of the CF lenses on the Flex limits one in respect to coverage since the lenses were not designed to be shifted, while the Arc's Rodenstock lenses are intended for view camera applications. The 35mm on the Arc has been my lens of choice in many situations since I bought one in 1998; from portraiture to architectural. The portraits I have made with the camera employ the wonderfully simple shift control that allows me to emphasize the subject within a space. Truthfully, the vertical shift control on a view camera is the one I use the most, so having "only" a shift on the Arc is perfect for me.
It is a compact and convenient camera to use. The size of the camera is so small that I take it with me whenever I travel. I also have the SWC/M with the wonderful 38mm and used that extensively until the Arc arrived. The Arc had a similar focal length, but I could use a shift which rendered more precisely so many opportunities as I always level the SWC/M which would lead to a vertical limitation without the shift.
I own 4x5 cameras and larger, but I don't think the comparison is strictly in format and features. The convenience/cost factor of roll film and where I can get the color versions of that film processed is another consideration when compared to sheets. Yes, one could use a roll film insert in the view camera and have the convenience of 120 film. But I prefer the convenience of being able to have more than one Hasselblad magazine when I need to shoot both black and white and color negative/transparency.
Admittedly, it is a little awkward when one needs to use an inverter arm to shift down. I have become used to doing this, so again it is no bother.
There's a few ideas on the matter. To see examples, (and not to perform any self-promotion), you might look at danoverturf.com to see many examples of the ArcBody's results in this practitioner's hands. Just look for the horizon line moving up and down in different frames, while the level camera's distortion is minimal.
Best of luck - D
