In a recent interview with the Pentax Ricoh China Japanese Head, it was told that the 645D was just a completely different product than the 135 FF Nikon D800E, which is far more differentiated.
However, this reminds me of the fact that the 645D, like all other K-mount Pentax DSLRs, is actually also cropped for its sensor. So, I just wonder, how is the 645D different from those 135 FF DSLRs and
