ACMS
You would need to remove several rows of seats from the 77W or add a lot more seats to the A380 if you compare the aircraft with the same product within the same airline. You would also need to add a fair bit of weight to the 77W to get the same level of IFE/Showers/bar etc as they have on the A380.
EK will have 3 A380-800 configurations, 489 for ULH, 517 for LH, and 600 for regional. The ULH aircraft will be deployed in time on the A340-500 routes, like DXB/SYD (DUB is Dublin not Dubai).
SQ have similar products in the 77W and A380 (the suite product on the A380 is somewhat bigger than the first class 77W). The 77W has 278 seats, the A380 471 seats. If you use the fuel numbers you came up with, the 77W is 482 l/pax, the A380 457 l/pax.
You then need to do the numbers again at realistic load factors, EK is just under 80% (about 79.8), not 100%. Tell me an airline that is getting 100% load factor for cargo, most average around 50-60%. Cargo is generally unidirectional.
Tim Clark has already said the A380 is burning between 15-22% less fuel per seat than the 77W. If anyone was to know what the EK fleet is doing, he should know. That is coming form the man who has one of the biggest 777 fleets in the world.