It is not clear how the numbers were derived, but comparing
the two cameras in the chart that I have, I can tell the
numbers are WAY wrong.

I have a Canon 1D Mark II and Canon 10D.  I have fast L
lenses (e.g. 500 mm f/4 L IS telephoto).  I can tell for without
a doubt the 1D Mark II is astoundingly fast compared to the
10D using the same lenses on the same subject, and
not just the 500mm lens).  To rate the 10D total lag at
0.189 second and the 1D Mark II at 0.235 second is just
plain wrong, unless you put the fastest autofocusing lens on the
10D and the slowest possible lens on the 1D Mark II.
I shoot a lot of wildlife action, and the response time
on the 1D Mark II is well under 0.1 second (total lag
time in my experience in multiple shooting conditions).

In real world action conditions, I would have two problems with
the 10D: 1) erratic action (e.g. bird in flight) with a complex
background (e.g. distant trees) has trouble locking onto
the subject and not the background, and 2) while tracking
a subject, if the focus point moved off the subject (e.g. due
to my inability to track erratic movement), the camera would never
regain focus until the subject stopped.

On the 1D Mark II, I don't have these problems.  Reports from people
in the field say the 20D has the same problems above, but with
the 1D Mark II, I can lose and reacquire the focus point on
a moving subject in what seems like well into 0.1 second.
The focus accuracy is much better on the 1DII also (having
had more than 50% out of focus action shots on a 10D, almost
all in good focus with the 1DII).

So, the table above is highly suspect.

Roger
Photos at: http://www.clarkvision.com