I cannot say yet if I like it or not, it is too soon. I found that I need some more time with new systems to get to know them before I can tell whether I like them.
Yes, I am a very big fan of the DigiFlex. Together with the Zeiss ZF lenses is it very good. Sure, it has some weak points as well. The ZF25 is visibly less than the 35 and 50 (both macro as well as 1.4). The 25 has a fairly large distortion the 35 distorts less but still. The 50macro shows a purple hotspot on dark items now and than, etc.. On the good side it is exceptionally sharp and has lovely out of focus rendering, colors are fantastic. I like that it leaves everything up to me, no metering, no AF, no nothing. Just a piece of glass, a body and a back and it can be handholded.
I expect the H to show less distortion on the 35, I expect the H to show less CA not that the ZF's show that much but it does on occassion and I hope DAC will correct that.
I can do custom white with the H which is impossible with the DF (due to the black borders).
I certainly don't expect the H to perform miracles, just to fill some gaps and weaknesses I found with other systems. Sofar it is less sharp than the DF but with twice the resolution it has an awful lot more details and after downsizing to 50% it appears to be identical to the ZF ( Sharpness-wise).
Nope, I bought another 35 about a week ago.
I am not sure whether you can do the firmware upgrade of the H1 by yourself. I had it done via a Hasselblad dealer (costs were around 400euros). They did some repairs as well and added the rechargeable battery & charger.