Had a ball down at Philip Island on the weekend with a local historic car meet. Sadly I arrived (and without a ND filter) so my shots were a little limited, ANYWAY!
With my K5, I had my DA200 and a DA50-135, having hear everyone tell me how rubbish it would be I was expecting to use them like I had my Taks previous, compose an part of the track I want a car in, wait for the car to enter, CLICK CLICK CLICK.
I was able to use AF-C to track them from corner entry, down out of the corner, all day long. I set my AF point to the right hand side (because that's usually where in the frame I wanted stuff) and it worked fine. As for speeds of auto-focus, I couldn't tell them apart, OH! both the DA200 and DA50-135 have been converted to screw driver.
Have some low res JPEGS;
A110
http://i.imgur.com/SXnXSlg.jpg
Yellow Mellow
http://imgur.com/6hzNdtw.jpg
Wrong way go back
http://imgur.com/FjqoosL.jpg
Just a little outside wheel
http://imgur.com/Gwp2VQa.jpg
Actually that turned out to be far worse :P
http://imgur.com/d7JojNO.jpg
Go chase things with your "crappy" AF cameras everyone.