I have never flown with Hong Kong Airlines but very tempted to try them from YVR to HKG because of their amazing airfares but not so good reviews keep me from taking the plunge.
I hear different viewpoints whether it is a low cost or full service carrier, though Hong Kong Airlines itself seems to think of themselves as full service carrier according to information below I recently received in a promotional e-mail. I am also surprised that it is considered a 4 star airline but it's Skytrax and it probably doesn't mean much:

Hong Kong Airlines – Where Hong Kong Begins:

Established in 2006, Hong Kong Airlines is a full-service airline firmly rooted in Hong Kong. From ground operation to inflight service, the airline is committed to delivering an exceptional customer experience with a unique flair of its home base. Hong Kong Airlinesboasts an ever-expanding international network, covering nearly 40 destinations across Asia Pacific and North America. Hong Kong Airlines also maintains codeshare and interline agreements with 94 airline partners, offering its customers more choice and convenience across the continents.


Hong Kong Airlines operates an all-Airbus fleet, and with an average age of five years, HongKong Airlines operates one of the youngest and modern fleets in the world, as it progressively takes delivery of 21 Airbus A350 aircraft. Hong Kong Airlines has been awarded the internationally acclaimed four-star rating from Skytrax since 2011. It was also the winner for Asia’s Leading Inflight Service in World Travel Awards 2015.