I was pasanger on a recent A380 flight. I had a look at the bunks as well.
It is quiet but there is also a problem with the locations of the bunks. they are next to the pasanger seats and toilets in economy. In other plane's crew rest compartiments you enter and climb steps to get to the bunks. In this one the bunks are the same level with the main deck. there is nothing in between apart from the door so you hear everything.