Well i tried some lvl 65 dungeons and there is no more loot then usual except 2x more Elions Mark of Valor. Same for GG and PoP we only get 2 gem drops but everythng else is same.
RKNM: first boss drops only 4 items and every other boss just give normale loot ust liek basic. I don't see any benefit from the 100% more loot buff.