Great summary, which I'm passing on to a friend who'll be on a 747-400 for the first time later this year. I'll agree to disagree about row 15 upstairs, which to my mind is the best.

Also, I like row 1 in F for a couple. My wife and I flew it last year and it has a nice feeling of privacy. We were close enough to talk easily and hold hands from time to time. But this is a judgement call versus row 4.