yup, each has it strengths. For action canon is better, in low light the pentax is better in noise control. But the k-r is almost as good as the canon for action. So if you are going after kids running around, the canon is a bit better for what you need, as the AF system will work better in low light.
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.