A few years back, I was upgraded to F at CDG and it was in the midst of a rather long spell of strike by catering services at the airport. CX carried foods from HKG for CDG-HKG. They did not have a full range of food typically available and they offered some meal vouchers as compensation to all F pax at least. I don't remember the value, though. I didn't take them as I had access to the Wing/Pier's F section.