OK, it's a small sample, but I'm not surprised the 1100D sneaked one in. 'Pro' doesn't mean you can afford all the 'best' gear; pros make their living by photography, not to spend their living on photography. And the 1100D can do pretty much all the others can do. Same reason high percentage of 5D IIs and D700s.
Also, dynamic range not required at 72 dpi ? Press photogs often need to get the images wired real quick, no time for pp so they need DR as much, or even more than the next guy. One thing you can be pretty sure of: these guys aren't lifting shadows by absurd levels in order to try and find FPN.
Not good figures for Nikon though.