Originally posted by Nicolas06 I don't get the PS honestly...
Pentax's PS is not just, or mainly, about resolution. It does away with the Bayer interpolation step. The color signal at every pixel is a directly measured value using PS*.
Without PS, the color signal for 2 out of 3 colors at every single pixel is a guess**. Which would you rather have, a picture with 2/3 of the color information a guess, or direct measurement of all color data?
* PS implementations other than Pentax's (e.g. Olympus') may not have this advantage.
** Granted the Bayer interpolation probably gives a good guess in many cases, but it is not a direct measurement.