Why do you think so ?
The only difference between a paladin and a warrior is color,
The brutal for for dk's have the same color as warriors, so therefor it should be the same t6 as well ?
Mage, Priest, Warlock - Same brutal / t6.5
Warrior, Paladin, Deathknight - Same brutal ( exception with exactly the same colors on warrior / dk's brutal ) / t6.5
Hunter, Shaman - Same brutal / t6.5
Rogue, druid - same brutal t6.5
Yet all classes has various t6 looks,