CX F hands down as first choice. The service and seat are fantastic.
CX J on LHR-HKG route has the new J seats which as far as I am concerned is comparable to BA F seats.
CX ex-LHR has low availability as it is a busy route. Ex-AMS, ex-FRA and ex-CDG has better availability.

MH F also very good on an A380, but there are comments there is no availability currently. Avoid J which has sloping seats.
QR F or J would be the alternate to CX. If J, make sure its has the new seats on board. Transiting DOH in QR F by private car between plane and DOH Premium Terminal.