Last month did LHR>LAX run with both legs in 51K.
I did this based on what people had said on this thread previously.
Having walked around all the cabins I would say apart from F cabins this section would be my pick of the choice for CW.
In the middle of the toilets and the CW kitchen so pretty well positioned. The toilets at the front of the cabin are great! Love having that amount of space.
Noise wasnt really an issue and slept pretty well. Loved the side cabin compartments except they do pop up now and then.
The view which people had previously mention wasn't that great for me. Because of the curvature of the windows I really had to stretch to see anything meaningful.