An outstanding report, even better in that it your first. BA can be hit or miss (mostly miss) but it sounds like you had an enjoyable flight.

I'm confused by your comments about the BA cabin being far more spacious than CX. Are you actually referring to CX Business Class??? With 14 pax stuff into the nose of BA 744 compared to only 9 in a CX 744, "spacious" is the last word that I would use when describing BA First.