I have flown F on UA, SQ, BA, LH and Ansett Australia. By FAR the best is SQ and BA. UA's new "suites" are nice, but dull in color and texture. They also are somehwat uncomfortable and not that easy to use. LH has a nice recliner seat, but no sense os "suite". Service on SQ and BA were excellent. UA was very mediocore. Ansett is always a nice airline.