It is not quite as simple as that as in present config there are almost 50% more premium seats vs a 777. EK long haul does seem to enjoy good load factors in the premium cabins, but who knows how much is paid for said seats?
The 380 apparently is capable of flying faster than a 777. The EK spin machine claims it will fly to NY one hour quicker than a 777, but I think they're talking possibilities, not the reality of conforming to speeds on the OTS and present cost indexes. I stand to be corrected on that one.
I think this is best left to TC and the boys in yield management to figure if it's a money maker or not. With 50+ on the way, we should all be hopeful.