The AF arrivals lounge is fairly small and windowless, but had a good cold breakfast (prosciutto, good chees, croissants, brioche, etc.) although not wine or champagne. Wifi seems fine and there's a selection of newspapers. The showers are pretty typical, smallish but IIRC with toilets, and can get hot and steamy. There's a pass through cabinet enabling you to have clothes pressed as you shower.

I've never been aware of any paid entries and the dragons are very strict about admitting AF/DL passengers and elites by the rules. Sometimes it seems like they turn away more customers than they admit.

ADDED: To find it, you walk along the main path on departures level, past all of the check in counters in 2C(?) coming from the center of CDG T2 with the train station and Sheraton. At the far end of the terminal, just before 2A starts, look for a carpet and a couple potted small trees. This is the entrance and it's hidden. At this point, you're close to the stops and ticket machines for the various buses to central Paris, the public ones and the one to Opera, which are different in terms of tickets/prices and stop locations.