I've flown OZ A380 several times -- about 8 flight segments if I recall correctly. HKG-ICN and ICN-LAX

I always sit on the upper deck. As another member mentioned, I rate it as one of the best economy seats (as someone who has also been on SQ and CX 777, A350, and A380 in the last couple of years). The 2-4-2 config is great. On the window seat, you get your own private storage as well.