I don't see a problem with using the FA35 on the 645D, and that shot just looks like it's overexposed (although a DNG would be nice).
It's rumored that a 25mm is coming for the 645D, which will be equivalent in FOV to the FA 35mm on film:
Pentax 645 25mm F4 Coming - Pentax News & Rumors - PentaxForums.com Adam
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