Low cost carriers aside and only listing major Chinese carriers flying internationally and exclude South Asia and Middle East carriers. This is how customer services are rated personally and does include unusual and emergency situations handling by crews and ground staff:

Tier 1
Asiana Airlines
Japan Airlines
Malaysia Airlines
Singapore Airlines
Thai Airways

Tier 2
All Nippon Airways
Cathay Pacific
China Airlines
Dragonair
Korean Air

Tier 3
EVA Air
Hainan Airlines

Tier 4
China Southern
Garuda Indonesia
Hong Kong Airlines/Express
Phillipines Airlines
Vietnam Airways

Tier 5
Air China
China Eastern

Cathay Pacific is only Tier 1 when you are Caucasian.