As always, we draw our data for the analysis from the wonderful Raidbots.com, which in turn pulls its data from World of Logs, where raiders upload parses of their actual raids. This gives us the absolute best data source that we have access to. These numbers are exactly what thousands and thousands of real raiders are actually capable of putting out in the actual raids, averaged over all of the bosses available.
If you'll recall, the DPS spread in Dragon Soul, while not perfect, was actually the closest to balanced we had seen in WoW history. So did Mists of Pandaria improve upon this balance? Or did we end up with boss mechanics and new abilities that widened the gap? The only way to find out is to sort through all the data, and then make pretty graphs out of them.