By coincidence I was on the 55 on Friday night but didn't go further back in the plane than 3K. I'm still not convinced by the A380. The quietness makes the sleeping harder and the air quality is certainly no different to any other plane. The large F suites are nice but you do feel a bit marooned from the window as there is so much space.
It's a nice plane - certainly much nicer than the 777 - but not the life changing experience some of the hype would have you believe. The poorer CW extra legroom options v the 747 are a real let down.