Great report, thanks, I was looking forward to hearing about the new AA 321T, and you beat the pack!
Just flew that seat on CX HKG-NRT and it's got pluses and minuses. I found it a little claustrophobic with that big wall of plastic on one side. Nice and private though and the direct aisle access is a big win over UA.
Interestingly, AA is currently selling F on this route for almost $800 less than J on UA ps ($3500 vs. $4300). We'll see how that works out for UA.