I find the CX bed in F to be much better than the BA bed in F. If you like the BA type of bed, then QF has the next generation of that seat, making for a significantly better F bed than BA currently has. Both QF and CX have a lot better food than BA. The primary BA advantage over CX is the BA Arrivals lounge at LHR (and MB spa upon departure for the LHR-HKG leg). Unlike BA, CX makes its lounges available for BA pax, so doesn't have any advantage over BA (somehow I don't think CX is worried, their F service is so much better than BA that it really isn't a contest).