Well I flew the 777 last xmas and frankly it was very pleasant, There is a 13 seat cabin variant used with 4k removed as part of a (curtained off) crew rest. Cabin crew are not meant to move down through the curtain here so actually the F/K aisle is very quiet other than service. Because this is predominantly a night flight the cabin is reasonably quiet all the time ( I know some believe there is constant crew traffic through the F cabin but not so I noticed)
The flight is marginally slower but well within the capabilities of the 777.