On recent 777 flight from PEK-IAH in F class, I will report the seats are fantastic. I slept like a rock. The food was OK, and the wine selection was good. The FA took my pre-flight drink order (I was the first to board in F class). I had be drinking Tsingtau in the lounge so I ordered another. She nodded enthusiastically, and later showed up with a gin and tonic. I thought, why fight it, and drank gin and tonics until dinner.
The F class lounge was a nice place to hang for a few hours, with plenty of food and drinks. The seating was very comfy, and had great views of the airport. I will definitely choose AC again from and to IAH.