From my understanding the biggest boost from the jobs is being able to equip the job specific gear, and the extra abilities. Each job was offered either exceptionally boosted gear (WHM set) or specific new abilities like the extra songs on BRD, or ws's on LNC, nukes on BLM+convert, PLD didn't get any extra enmity specific abilites except holy succor.

The question is how much enmity does holy succor generate, I know it can cure a lot of total HP from target + self, this could be generating the equivalent enmity of 2 provokes (depending if it uses enmity like cure 75% cured point for point into enmity generated) Also figuring if the healing potency can raise this and the fact that it can be nearly spammed barring MP limits it can really pump up a ton of enmity very quickly.

From a limited amount of testing I think we just don't fully understand the PLD's potential as a community yet.