Had to fly economy, the seating is larger and more comfortable than my recolelction of the 747 and other long haul aircraft. Suggest sitting upstairs on the outer isles where there are two seats only, not three, and due to curvature of the fuselage, there is a bin (and more space) under the window, same as upstairs on a 747.
For information upstairs at the back in QF is premium economy in an A380. Well it was in the one I was on. The rest of upstairs is business.
Very pleasant upstairs in QF on the A380.
Michael