Our Monday article "A380 suffers new blow, future remains bleak" describes how Air France hands back five of their 10 Airbus A380-800 to their lessor with start next year.
The article details the reasons behind the returns. Other media writes the A380 are notably more expensive to run than a Boeing 777-300ER.
As so often this is a serious case of apples and oranges.
To compare aircraft like for like they need to be compared with the same rules for cabins and operations.