I think you'll find the A380 a remarkably quiet experience compared with almost everything else in the air. I almost don't need noise canceling earphones to make my flight pleasant.

First will depend on your cabin crew. Of the three onboard experiences for me that distinguish First from CW, a lower density cabin with better seats, somewhat better food and beverage, and at least to me, the concept that you get what you want, when you want it (presuming, of course, some level of reasonableness), the first two seem immutable.

The third totally depends on your crew--if they're fully invested in that concept (again, balanced by reasonable demands), your experience should be fantastic; if not, then your experience will vary in direct proportion to their level of interest.