Originally posted by johnha As mentioned, cost and the very niche market (therefore increasing unit cost) is the reason - similarly I doubt there will be an 'expensively affordable' FF 645. While the D is a fantastic camera and handles exceptionally well - I can't help thinking I'd prefer it in a 33x44 67ii type form factor with the 645 mount (similar to the Leica S).
Recently saw an "ugly" leica S 006 body for $1699. I had to research it. A man in Hong Kong makes custom adapters for Pentax 645 lenses on Leica S. The Leica forum is full of people shooting Pentax lenses. They are very happy with Pentax and love the 75mm. So your dream combo is already "'available".
If something ever happened to Pentax MF, I could see myself with a used Leica body. I'd probably prefer it to Fuji. Amazing how short the registration distance is on the Leica.
Thanks,
barondla