So sad. The A380 is my absolutely favourite plane and I usually go out of my way to fly it. It's so smooth and relaxing to be on.
The 787 is quieter than the A380 from the outside (fewer engines, less thrust), but a little louder on the inside (thinner fuselage, engines closer to fuselage).
The A350 is the best of both worlds and is on par (or slightly quieter) than the A380 on the inside.
For the best experience, try the A350 on Singapore or Qatar in business class.
Selection bias? Try—
"Because the A380 is the top level equipment operated by the carriers, pay scale for pilots is greatest. Ergo, they are flown by the most senior crew; since practice correlates strongly with proficiency these pilots have a higher rate of grease jobs." (1)
(1) Grease job = industry lingo for a buttery smooth touchdown, aka, "painted it on." :-D