I'm in Singapore right now, got here in row 61 on an A380 flying JFK-FRA-SIN, gonna be doing the same trip in reverse tonight in row 83. I originally had different seats for both trips, but decided to change to the back of the plane on check-in to see if I can score an empty seat beside me and to avoid having to get up to let others exit out to the aisle. This kinda worked so far: JFK-FRA I had a free seat beside me, but FRA-SIN was a completely full flight.
I don't fly internationally much, but I did notice that the A380 was quieter than I thought. I did LHR-SIN RT back in Feb in business class on the UD, as far as I can remember, it didn't seem any quieter than being in the back of the plate.
I got some significant turbulence on the flight here in the back of that A380, and I've never felt so much horizontal movement during turbulence - I'm only used to turbulence causing mostly vertical movement. Maybe this is unique to being in the back of the plane?