I've flown 789's and A332's, but I've only every flown a 777 once, it was 10 years ago in J on Air France from CDG-ATL. On that flight the seating in J was 2-3-2 across, it was comfortable but they weren't lie-flats and weren't pod-like.
The AA 777's appear to have 4 across in both F and J, but the plane is wider than the 787 or 330. How does this play out? Are the aisles just significantly wider? Or the pods?