I took AA DFW-KIX in First...It was amazing. It did not feel like AA at all. This was back in 2000. It may have changed since then. But I had a great flight. I think I have a trip report on it from then, but I'm not 100% since it was a while ago.
I will agree with Ryan. Have used AA three times across the Pacific. Twice on DFW-NRT in J class, and once on DFW-KIX in F class. As stated before, the Pac service AA offers is top of the line for the carrier. 14 hrs flew by!