Yes as I fly out of DFW which is exclusively 777 4-class I can confirm that CW is loud everywhere. I have flown the UD on a 747 once and it was an entirely different experience. Not only is it quite and more roomy but I think the cabin humidity is better than on a 777. I arrived vastly more rested.

I always ask if they are offering paid upgrades to first at DFW because getting up in the nose reduces the drone of the motors.