Hi Guys,
I'm from the old school, I like to keep things to the sensor optimal rating. CF39 was @ ISO 100 and then at ISO 50 with the later FW. But I always rated the sensor @ ISO 100. As per Dustbak comment, I have never attempted 400 or 800 on my technical camera as I need to keep my shutter speed of my Copal O below 1/125th (for hand held point-n-shoot with my WRS) - YES - even with double cabling.
I never shot CF39 with H2 (albeit why it had 31 actuation). I use my CF39 99% on my technical camera.
Caveat: Hasselblad adgenda is still currently on their H "closed" system. CF DBs are the only one that allows to shoot on H2, H2D and H2F (and that is it), and other cameras with V-mount (inc CFV39), M-mount etc, because of the various iAdapter mount availability. Which you know base on your current DB.
Cross-breed a DB and a DSLR camera of different brands, there are other brands DB that have better track records - or you just need to know how to work around issues with band-aid solutions. I know someone here that I have been talking to who shoots P65+ w/ H2 and he/she loves it.
Dustbak (...you're welcome) and I have our CF39 DBs on sale. My DB has the only adv in that the new owner can take over with the extended-warranty per said fee under the CPP before the original warranty (non-CPP) expires in May!
I'm selling mine so I can move to P45+. I need looooonnnnnngggg.... exposure - more than 3 min - so I can make people disappear when doing arch/landscapes photography. Hard to remove people in post production CS/PS!