I'll need to find the source, but off the top of my head it's as follows:
Normal: 100% EXP
Expert: 130% EXP
Masters: 140% EXP
Kings: 150% EXP
My bad, it's:
Normal: 100% EXP
Expert: 140% EXP
Masters: 180% EXP
Kings: 220% EXP
I tried to do Kings as much as possible because I used to think Kings = more potions/equipment will drop. Now I feel if I were to solo farm a dungeon Experts/Masters would be just fine. As a duo, I think try to stay away from Kings unless the quest needs you to do so. As far as I know, quest/purple+ equipment drop rates are increased at higher difficulties, but again regular drops like potions, white/blue gear, and stuff like materials don't seem to be affected so greatly according to that link I posted.
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