Weirdly enough I prefer the 777 over the A380 in J
The only exception is if I get 23A or 23 K on the 3 class A380 in which case I have to agree that its better( if you ignore the service issues and the refection of the pax in the next seat ( on the flower vase).)
The service on a A380 is inferior to that on a 777 IMHO unless you have status with EK. Even then its a bit hit and miss but I think on a overnight flight to the UK the A380 is better.
On a day flight I prefer the 777.