The airline with the best average rating is Finnair with 7.2/10.
The average flight time is 10 hours and 56 minutes.More information
Finnair Long Haul is a great product. Too much different from the European Flights. In all my flights with they the crew was incredible. I visited the cockpit in every flight, the Flight Attendants from Asia are super correct but the Finland Crew are so warm and kindly.
They retired the A340 and now just fly with A333 and the new A350. If you have the chance, choose Finnair, i think will be a incredible experience.