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The burn per seat comparison is valid if you work on yields. I have already pointed out what this means with them eroding ....
If you want to go into pure aircraft performance, you can only work with burn per kg transported for the same distance. In that respect 4-engine and 4 legged monster can not compete with a twin with two legs.
Concerning the 77L compared to the 380, on ULRs it also matters if you can take the full load or not, and on that I wouldn't line up the whale .... and by the way: On the burn/kg the 77L outperforms the whale by quite a bit on ULRs.
You can twist or turn it whichever way you want. The whale can generate profits on LH and even ULRs, yes, but it needs a stable and low fuel price and customers who pay a fair price for their premium seat. Otherwise its yield erodes much quicker than the more economical Boeings. That's its Achilles heel and its due to its overweight and lower seat/bag-freight ratio.
EKs thrive to implement a combined service to destinations with a 380 and a T7 seems a smart choice.