I took the AA 777 a couple of weeks ago and REALLY liked it. Very comfy. Only mildly annoyed that my assigned seat (1A - a window for the day flight) was inop and I got reassigned 7H, a seat in the centre of the cabin.
The food on AA is not brilliant, as we well know. But the cabin design is lovely, the duvet and pillows add some comfort over the spartan BA offerings, and so overall I have to say it gives BA a run for it's money. I'm quite happy to trade that for most any seat on a BA 777 or 747 (maybe not 62J ;-)
(Edited to add - oh yes, and wifi on the eastbound daytime flight was fantastic and reasonably priced!)