You make a good point Joel
The Canons use a CMOS sensor which seems to be a slightly better
technology from a noise perspective. I don't know why.
The Pentax uses a CCD sensor - different technology, perhaps there are other advantages? I image there are tradeoffs.
Canon seems to have an edge in the noise area, probably because of this.
However, Canon does not have the SR in the camera, which is what sold me on the Pentax. The SR seems to more than make up for the slight noise advantage of the Canon.
I'm amazed that I can shoot a pretty good picture handholding a
300MM lense in moderate shade with the K100D. I love this camera. It has all the same creative control of my old Minolta
X700 and then some. The controls are accessible such that I don't have to carry the manual around with me to use it and I can make
adjustments before the light changes or the animal gets bored and leaves!