Arrrrrrcane mage!Well like I said, I am not trying to say that it is hard evidence. Just pointed out what the logs say the difference are in dps output between top 25% and top 1% of each class.
A full list from high to low.
Demonology Warlock
Feral Druid
Combat Rogue
Destruction Warlock
Fire Mage
Windwalker Monk
Balance Druid
Elemental Shaman
Fury Warrior
Shadow Priest
Affliction Warlock
Retribution Paladin
Assassination Rogue
Unholy Death Knight
Frost Mage
Arms Warrior
Survival Hunter
Enhancement Shaman
Frost Death Knight
Beastmaster Hunter
Still, not it is not a good evidence. Rather a guideline.