Having the opportunity to test it for myself, I was very favorably impressed with the Leica S-2. Of course with a $30,000 price tag, it's unlikely I'll own one any time soon...

The new Pentax 645 is also an important new medium format for the sheer fact that the entire setup is at a price point below the average digital back which is bound to force the "big dogs" like Hassleblad & Phase One to rethink their pricing structure going forward.