At ISO 3,200, the JPEG photos don't look terrible, but you can see some color noise and images develop hot pixels. As usual, Canon's JPEG processing is pretty good. I couldn't get much better results from processing the raw versions--different, but only by trading off dynamic range for color and grain.
Even ascribing some of the blur to imperfect panning on my part, the old autofocus system isn't great if you want to shoot a lot of action. However, at relatively small sizes the results look OK and the camera's burst performance is just good enough to keep up with subjects moving in a predictable direction.