The level 50 job quest (at least for white mage) now rewards you your ilvl 50 robe, and also your ilvl 90 robe. Not sure why it rewards both, probably because the ilvl 50 one is a more or less unique item that they didn't want to remove. I assume this changed with patch 3.0. I didn't complete this quest until post-3.0, and I haven't done any of the other level 50 job quests but I assume they changed their rewards as well.