I was surprised how ANA (#3) main cabin was so much better than Delta main cabin. Few years ago, I ended up in a middle seat at ANA when my Delta flight from Tokyo to Seattle got cancelled (after 3 hours on the plane stuck on the runaway). I had comfort+ seats. I also had SEA-SFO on my itinerary.
The only way out was flying stand-by on ANA directly to SFO later that day, or waiting 2 days for another Delta flight since everything was packed. I was the last one to board the ANA flight and ended up arriving about the same time as my original itinerary. At that point, I was just happy to be on my way home (I had a little child and work commitments).
The seat was surprisingly good. I don't remember the airplane model but I had enough leg room and didn't feel too trapped in the middle seat. The food was also not bad - maybe I was just so tired given the stress.
I flew Japan Airlines (#2) in 2008 - it was the only time I flew on a jumbo double-decker (and on the second floor!). It was not Airbus but I don't remember plane model. I was sick and don't remember much other than how cool it was to go up a level inside a plane (economy seat). I was connecting in Tokyo from JFK on my way to the Philippines for work.