I would take CDG over JFK any day, especially if the DL terminal is involved. The place is a mess and the people who work their make the folks at EWR seem like charm school graduates. That it is the POE for so many international flights is a disgrace to the US.
I completely agree with Channa. My French is rusty at best, but I have a few phrases down pat, one of which makes fun of my poor use of the language. It always gets a smile. That, and a courteous greeting before jumping into business have helped make my visits to France very enjoyable.
For anyone needing to get from IAH to Europe, I would highly recommend the late-night AF flight. Even the people in Y seemed content after a nice dinner. I don't think I would want to take an AF 777 because of the seven across configuration. CO has the edge in J on everything but the Airbus.