I did HKG-PEK about 18 months ago as part of a J class RTW. As others have noted, perfectly acceptable, given length of the flight -- not a patch on the NZ leg I flew immediately before (LHR-HKG), but no reason to shun. CDJZ only earns x1.5 and FAP only x2, but that's still better than x 0 for CX.