I travelled with Emirates on the A380 from DXB to SYD last year and I was impressed with the aircraft. As others have said the big difference, compared to other widebodies, is the lack of cabin noise. On application of take-off power there was a perceptible, but distant, increase in engine noise but nothing close to the levels of other aircraft I've travelled in. I was sitting on the lower deck forward cabin and while stretching my legs a few times it was evident that the low sound levels extended right through the cabin, even around the doors. I had a window seat and one difference I noticed was that the distance between the scratch panel and window was quite large and wondered at the time whether the corresponding distance between sidewall assembly and fuselage had been filled with extra, or some fancy new style, soundproofing.