The 380 will carry max ZFW out to 14hrs (for the old ones) and 15hrs (for the new ones).
The new ones are you referring to EEF onwards ?
Any idea when these aircraft will be deployed on 215/225 ?
So on ULR flights the 380 is carrying the same if not more cargo as well as the extra Pax.
That will not be very popular statement to make around here.
On a sector length under 12hrs the 777 can carry 10t of cargo more than the 380.
Average cargo densities for AKE are around 190 kg/cubic meter, and 194 kg/cubic meter for under floor PMCs (main deck PMC tend to have lower densities). With your typical layout of "8 LD36/PMC and 20 AKE for the 773ER and 6 LD36/PMC and 22 AKE for the 380", makes for some interesting passenger numbers if you are saying the 77W is carrying 10t more cargo.