If Phase can develop a body that fits in the hand like the Pentax 645D and give it a big bright viewfinder, and whatever technical stuff required to get it "good", then it would be about perfect for me. (I haven't shot with a Phase/Mamiya 645 so not 100% sure what my issues would be with it, so won't suggest specifics). In fact, I would be happy enough with the Pentax if it offered new wide, normal and short/medium tele leaf shutter lens with 1/800 sync speed. Unfortunately that is not the case. If it wasn't for the price, I would have considered the Leica S2, but at that price, I prefer the idea of seperate back and body. If the body is as nice to handle as everyone seems to say, why would you want to get rid of it in a few years. It seems a waste to make something of that quality as such a disposable item. The lenses are different as they are obviously a longer term investment - assuming that the S Leicas continue on into the future.
Anyway, like I mentioned in my last post, I will stick with Canon and try and make some money - rather than spending money I don't really have. Hopefully if my business is successful over the next 18-24 months I can invest in some digital medium format gear. Some lighting and essential computer upgrades will be more likely to bring more money in than a new camera.