I'm not anti-A380 in any way, as it gave me work in some of the airfield mods reqd for its operation.........and I've only flown on one twice, in fact my last long haul flight was a BA A380 on the LHR-SFO-LHR route a few years ago.....
However, I guess as others have mentioned, being a Bloody Awful flight I really didn't think it was any better than any other flight I've taken long haul.....I certainly don't remember thinking, wow this is so much quieter and BA's cabin config didn't make it any more spacious or comfortable than any other BA flight.
Sadly, I doubt I'll fly on one again to be able to have another go at comparison.