Helblad H2, Imacon Ixpress 16mp back vs Canon 5D mkii?

Alrighty, one last question regarding affordable digital medium format vs some of the more 'higher' end dslr's. I have noticed a Helblad H2 with a Imacon Ixpress 16mp back for sale for a bit more than a 5D mkii, but still a lot cheaper than a 1Ds mkiii. It is right in my price range. Now what I am wondering is how well would this compare to the quite newer 5D mkii? I know that the Canon will beat it every way in low light conditions with the appropriate lens, but generally speaking which is better for portrait work outside the studio and landscape photography as well? I am looking the best quality for my dollar, and upgradability. I know that it is a rather old back, and that is why I am concerned about it's performance vs the 5D mkii. Also according to the owner, the back has just been serviced my Helblad (cleaned and calibrated). The back before being serviced had 9000 actuations, but now has been reset by Helblad since it has been serviced. On time is 19 days, 8.6 hours. The body has 25188 actuations. I am just wondering how that sounds to you all as I have never owned any system like this. I know Canon pro cameras such as the 1Ds etc is rated to around 250k actuations I believe, and I know that the Helblad is a pro camera, so I would expect a similar life time for it as long as it was taken care of accordingly. The only thing I am worried about is the on time (for the back im uming). I have no idea if that is a lot of time on the back or not. And yes it does come with a Image bank. Thanks for any help or suggestions!