Although so many people recommend QR, I still wouldnt try it.
Not because of the airlines itself, but the location of QR's hub (all ME3 have this issue.)
Personally I prefer to fly 12, 13 hours from HKG to Europe, plus 1 or 2 hours connection to other destinations rahter than transferring via Qartar with two 6~8 hours flights.
One 12 or 13 hours flight would bring me more rest/sleep and enjoy the onboard dining..