The Pentax WPi has 5 auto WB settings plus manual as well.There is a new version out, W10.
WPi :2" screen, 4.8 oz
WP10: 2.5" screen ,5.6oz
As I am typing this, the sun has come through the window, so I have just performed a screen test, no difference detected, just as bad as each other.
There are some more settings on the WP10 but the lens/CCD/firmware is the same.
I think that the Olympus has a heavier compression ( I will test this later) and that the lens in the Pentax is a tad sharper.
No that is not it. On the highest setting the Olympus will produce a 3 to 3.2 MB file and the Pentax ranges from 2.4 to 2.6MB.
The WP does have some agressive sharpening but it seems to me that the difference in detail has to do with the lens.