There is interest in the 645D and the use of Pentax 67 lenses so I thought to post this. Taken in a country graveyard on the shore of a frozen Lake Erie, so I'll add a favorite quote from Thomas Grey. Performance of the lens is remarkable, really it needs a better sensor; crop is actual pixels.
"Full many a gem of purest ray serene
The dark unfathom'd caves of ocean bear:
Full many a flower is born to blush unseen,
And waste its sweetness on the desert air.