I'm rank 41 Valor. I've battled against Battlemaster and Champion Sorcerors, fully geared, all the time. They are easy prey for me, once you know how to lock down their casts and keep a lot of pressure on them they really aren't hard to kill in a 1v1 situation at all. And obviously they can get 400k easily because they have AOE, As well as ranged attacks.
I was talking about a 1v1 situation. A Skilled Assassin should always win vs a Skilled Sorceror.