Originally posted by Philippos The fact that all previous models shared every single thing.
Yes, simply because that when Samsung and Pentax signed the partnership, Pentax had models in the r&d and Samsung did not. It takes 2-3 years to develop a DSLR, it wasn't enough time for Samsung to make their own version so Pentax simply re-labeled their own DSLR's to Samsung.
When Samsung joined Pentax, the K10D design and features was already set. Samsung input on the K10D was only 10% (the DDR-memory comes from Samsung).
The parnership is about co-developing DSLR, so now is the time to release the first co-developed DSLR's. The previous ones were almost all Pentax. Of course many parts will still be the same, just like Fiat and Lancia or Audi and Skoda. But they may differ in features and implementation.
I wouldn't judge the new Pentax by the Samsung GX-20.