I think "Photo Techniques" did a similar study (was it "Digital Photo Pro"?) that showed varying dyanamic range between a # of cameras. The best cameras did very well. What was interesting to me was that the camers with the widest DR were not known as the best cameras -- because, apparently, they also had a lot of variance (noise) in the extremes of their ranges. Cameras with low variance AND wide DR were, as you might expect, top-dollar items.
(At this point the little clown on a tricycle comes through reminding us all that film frames do not display these artifacts, and behave with great consistency across all acceptable ranges -- that is, they are still a match for the best commercial/consumer digi sensors)