This is the most interesting stat to me:

Lines of custom PHP/JS code

Joomla! - 30
Drupal - 220
WordPress - 1,808

Kind of demonstrates how Drupal and Joomla can do a bit more from the web console than with custom code, but of course WordPress can do anything with the right amount of code. Expect to see that number for WordPress drop over the coming years as more features are added to WP...or maybe not if it is only blogging software? :P