Well, the A380 is a bit of an odd beast under the floor.
Emirates are suggesting that for cargo 3 LDP pallets & 5 LDC
QANTAS are suggesting 5 LDP & 3 LDC
LDP= pallet 88 or 96 by 125
LDC= your generic baggage container
It is probable that there is less cargo capacity by volume (not weight) but it is highly dependant on all-up-pax (more pax = more LDC for baggage = less cargo)
It is not in the 777-300 class cargo wise
(an remember I was taking numbers (a) out of my head but they're usually fairly accurate and (b) I did say "good" cargo sectors. It'd be a different sert of numbers if I selected a icy monday morning from Europe in January...