Canon S400 vs Sony P10 vs Sony P92 vs Oly C50

I already know that the Canon Powershot is an excellent ultracompact
as far as optics go....outdoor pics look just as good as Canon G3 in
auto mode.

I am curious how the Sony's hold up. I hear they produce exaggerated
greens. Other than that, how are the optics? I read the reviews on the
P10. Not bad. I haven't seen any reviews for the P92. Since the P92 is
a little bigger and heavier than the P10, I was wondering if is a
better camera even though it is cheaper. Amazon.com has the P92 for
$399 and the P10 for $449. They are both 5 Megapixel cameras.

I am almost sold on the Canon S400. I would use this as a second
camera for grab shots to keep in my purse at all times. I just wanted
to know if the Sony's hold up....the 5MP tempts me. I want the
cropping options available to me.

How about the Olympus C-50?

Owners or people who have used the above cameras please reply here. I
would especially love to see side-by-side photo comparisons and hear
criticism from people who have operated combination of the above
cameras. THANKS IN ADVANCE!