I just took a flight from Hong Kong international airport to London Heathrow airport, flying with Cathay Pacific. Let me share my experience with you.
Hong Kong International airport
Hong Kong International airport is a fantastic airport. Wow! Everything is just wonderful. The airport is clean and the staff are nice. The most important of all is the wifi service. It allows passenger to access the Internet wherever they are in the airport (even in the un-restricted area).
East hall traveller lounge
This lounge is not bad at all with a wide range of food and services although the lounge is a bit too much people. However, there are enough space and seats. There are a bar table and also a small buffet area, providing sandwiches, noodles, rice and etc. drinks are also unlimitedly provided, range from soft drinks to wines.
Well, my flight is scheduled to depart at 00:35, but boarding starts at 00:20 and the plane leaves gate at 01:00. After taxiing, the plane finally departs at 01:30, almost an hour late as the porpoised time but arrive on time as scheduled. The flights attendants were doing their work extremely carefully for pre-flight checking like switching off electronic devices, seat beats and loosen items. Double checking was conducted. The in-board entertainment was good with more than fifty movies and TV shows available. Music ranged from classical to pop is also available and games are provided. The food is not excellent but not too bad. I think the white rice provided is too hard but the appetizer and the desert (ice-cream) is wonderful. During the flight, snacks are provided and passenger can freely get them. A tiny turbulence hit the flight but the pilots are capable to sort it out. Both taking off and landing is taken in good manner.
London Heathrow Airport
I can say that London Heathrow airport is much older than Hong Kong International airport but also one of the busiest airports in the world. Although the queue for immigration is long, there are enough staff so waiting time is not long. One thing I appreciate London Heathrow Airport is staff will take all the luggage out of the belt after a period of time. This make travelers easier to get the luggage and decrease the time to find their luggage.
Maple Leaf London Arrival Lounge
This lounge is managed by Air Canada and it is not easy to find as you need to get out to the bus station before getting into the lounge. The staffs are kind and provide help whenever needed. The showering facilities are prefect for travelers taking a long flight. Although less facilities are provided compare to Hong Kong East Hall Traveler Lounge and wifi service don't seem to provided, there are computers and coffee corner is in service.