It's on par with the LH FTL (business) lounges at FRA.

Booze: mediocre

Food: not much; fortunately there's a sushi place about 100 meters to the right when facing the door.

Wireless: free. ^

The UA RCC is a bit cozier, has better vodka, has showers, but no free internet. It is also possible to walk to the gate in Terminal C from the RCC without passing thru security other than gate harassment, whereas the CRC is between main security and that annoying extra security check one gets on flights to the US or UK in Terminal D. Afterwards, there is the possibility of gate harassment too.