We decided to go with LH F too. We're going to Europe next fall, and instead of AC C we got LH F - routing is YXS-YVR-LAX-FRA-VCE and back from FRA. I think it's definitely worth the extra 20k points for F on the longhaul (esp for a long flight such as from LAX), and definitely happy that we're leaving from FRA on the way back so we can enjoy the FCT. ^