Sharpness? With a K-3, just use a tripod, a sharp lens like the 35mm f/2.8 Macro Limited, and further increase sharpness if needed in post.
I'm gonna wait for the FF, which I assume will have the same pixel-shifting technology now that it's been released, and I hope and hope it will include a built-in flash (not used that much, but great for fill-flash and impromptu party shots). I can do without the GPS, as I have the auxiliary GPS device which works just fine with the K-3. If the new FF will have both GPS and on-board flash, that would be ideal. As a suggestion, why not put the GPS into the new battery grip? THAT would be outside-the-box THINKING! Are you are listening, Ricoh-Pentax??? Hint! Hint!
John
PENTAX : PENTAX Photo Gallery artist page