Out of curiosity, those looking for high MP cameras... why do you need anything above 18MP?
What kind of pictures are you going to be printing or publishing that requires like 30MP and above?
(1) Extreme aspect ratios (cinemascope, ca. 2.35:1 or square)
1-Shot-panoramas with moving objects/subjects
(2) Large prints for the wall
(3) Strange light sources (fireworks, Neon/LED light, sunsets) which will profit from a 2x2 binning
to sum up R-G-G-B in one image pixel
I am shure that 12 MPix are sufficient for 90 % of
MY images, I really have to learn to master the 10MPix of my 40D.
But I dream about a 48 MPix FF camera with a RAW mode (or DPP "special buttons)) to calculate clean 24MPix and ultraclean 12MPix images.
But if it is possible to acquire more data I would prefer to use it. Consolidation of the 48MPix information into a 12MPix .cr2 data file with DPP or another post processing tool would be great: If 12MPix are sufficient, why store/operate with 48MPix files? On the other hand, if I have a good image where 48MPix are helpful ... it would be great to store the full information.