Originally posted by Pentaxor auto-focus speed would also depend on lens speed and lighting condition. about comparing the K-7 which frank tested to be faster than the k20d,speaks in itself that the K-7 is really fast. camera brands have nothing to do with superior AF speed. it's a combination of the camera's auto-focus capability, lenses used, and the photographer's knowledge on focusing. so it doesn't matter if you're handling an Mk II, if a K20D user focuses faster than the Mk II. does that mean that the K20d's focusing is better than the MKII? again, it's about learning the ropes regarding focusing. you cannot judge which system is faster unless you've learned to maximize or reach the full potential of a camera's AF capability.
To me this sounds like a contradiction to your own statement. Yes, camera user can increase speed of AF. But you saying camera brands HAVE NOTHING to do with AF speed and then in the next statement saying it IS contributing factor to AF speed performance does not make sense (contradiction). Also, the lens used is also tied to camera brand (SDM vs. others, for example).
Maybe you meant to say that camera brands are often over emphasized as to contributing to AF speed. Still may get argument from many people.