i didnt read all the posts, so sorry if someones already mentioned this-
if you are wanting to shoot people, more important than any amount of pixels, is capturing a decent expression. I have had a H1 with a p25, and now have a p40+, and it shoots way faster than either system you are considering, but its still too slow often. I do use the p40+ for people, but when time is critical, the speed of a canon guarantees a shot more often. subtle expressions can only last for a split second, you dont want to miss that expression waiting between shots.
the hassy shoots only 1.4 sec per frame, the phase .7 frames a sec (i guess that works out the same).
my p40+ shoots 1.2 frames a sec. resolution has never been questioned by any retoucher with my 40mp, and ive shot many international campaigns, often with the shots blown up on very large wall areas.
so, my opinion is get something that gets you a better hit rate for shots, than completely obsessing on every pixel. and as far as a "look" of the back, you can make many of these files look identical with a tweak in CS5. Ive shot campaigns that hasn't allowed me to shoot the whole think on the same digital back, and ive had to use an A22 along side a P25, or a 5d file alongside a P40+, with some careful tweaking the shots look like they are shot identically.
paul