There does seem general agreement that the 777 is notably noisier aircraft inside its cabin than its competitors, I have wondered exactly why this is. Engine positioning ? Noise transmitted through the air conditioning ? Thundering through the night long haul on one is not my transport of choice at all. Certainly on the BA fleet, whether the engines are GE or RR seems to make no difference. 747 is far better.
For a long time I was so impressed with the A340 in the cruise for quietness, and the A330 is nearly as good, but the A380 seems to have beaten them all. Does Airbus actually put more sound insulation into their aircraft ?