In the sCO days, I did the 772 LHR service from EWR frequently. That said, we went last spring and did the outbound leg on the 772 and the return leg on a 752. I know a lot of people whine about the 757 TATL service, but I think I actually preferred it. The crew was amazing, they "seemed" more personal on the 757--I'm not sure if it was the smaller cabin, or if there's an extra crew member in that configuration, but I'd certainly do it again.