A few sources of confusion arising from the fact that both KE and AF appear to be talked about on this thread.
1. Kosmo Suites (i.e. KE F) used to be only available to top-tier KE Skypass members, but not anymore. Now it's open to all, including the A380.
2. Air France, I believe, remain unbookable in F apart from Flying Blue elites booking the Flex awards.