Just jumped off a 777 in J and I have to admit I loved it..

The UD on the 747 is slightly better but the new 777-300 win for me in every class but F..

New WT, quieter.
New WT+, the new WT+ seat is way better than the old one
J with brand new seats, more clean and with bigger screen and the view of those huge engines which I personally love..