My experience in CX F has been excellent. If you're not familiar with the lay-out on whatever planes you're flying, go to seatguru.com to check out the options. Window seats are generally much better than those in the middle because of the added privacy.

I started a thread on the AA board fairly recently about how lousy it is to connect at LHR, given the disorganized, ad hoc nature of the arrangements there, I guess in response to security concerns. Sorry I don't have the hyperlink handy, but you can find it be searching threads I've started there within the past few weeks. Many of those who posted subsequent comments on LHR agreed, with at least a couple suggesting going landside--that is, going back and forth throught immigration, using Fast Trak. In either event, to be on the safe side I hope you have at least two hours to make sure you make your connections there.

As for Hong Kong, I've only been to the CX F lounge at the Wing, but it's great. (The C lounge is also great, just not to the same degree.) Ask about the cabanas--semi-private rooms where you can lay down, shower, etc. They may have them at the Pier also, but I'm not certain.

In HK you arrive on one level, pass through security and go up to another level--there's only one terminal. It's pretty quick and easy, but if you've never been there before it may not be absolutely obvious where you go through security to go upstairs. But there are plenty of people to point you in the right direction if you're confused.

Have a great trip!