"Actually the crew in F seemed surprised with me coming in, and other F passengers did not show up for another 20 minutes or so."

A little OT, but you know, I have noticed on IAD-CDG-IAH flights on the rare occasion I upgrade (I'm usually in Affaires) that I seem to be the only person in La Premiere who wants to board early as well. I don't know why I do, except force of habit, but I seem to be the only one. Though they may have just been surprised to see you without an attendant trailing. Which is actually the one part of La Premiere I would probably prefer to do without. Though I always find it pleasant to talk to them, I know my way around. I wonder sometimes if they are concerned that some La Premiere would get lost.