I recently took my first flight on the a380, to which I connected after spending 11 hours on the 747-8i. It was my first time on both (both in J), and I have to say that I was blown away by the 747-8, while I found the a380 to be unremarkable. Yes, it's quiet, but if it's any quieter than the 747-8 or 787, the difference is negligible, and the way that LH configures its a380, the business class cabin feels more like premium economy due to the sheer volume of seats. If I'm flying coach, then I'll take the a380 over the 747-400, but I have to say that the a380 doesn't provide a remarkable experience, at least in J. I fully realize that YMMV, but for the sake of playing devil's advocate...