I still use both, both camera are nice and accountable, which I am still using until today, so many years later.
The biggest difference or me is H2 is much softer in mirror damping, the camera sounded more quietly than H1 haavy mechanical sound, seemed something hitting together and also feels it is slightly more camera vibration.
As H2, similar to H3/H4 in sounds and vibration, feels a bit more smooth, less vibration, sounds like a car with better engine, I shot mainly in studio and sometimes location, the other function are similar and I did not use that much on the camera digital function - which in many ways far more advanced than some current Canon and Nikon, for example user own definition on delay, self-timer, and etc. for real shoot, which I use P1 backs and Sinar, I don't see any image or even focus difference between the two.
Both are great cameras, robust - except I really hope H camera don't double the battery as hand grip, it does not provide the most security feel although it so far has not failed.
Pingang
Shanghai