Please note that all my experience with S.A.B.E.N.A. is at least ten years out of date.
Credentials- I have flown Sabena about twenty times between LHR and BRU on 737-200s. I have flown Sabena BRU-JFK four times 3 747-100, 1 DC-10-30.
I have flown BRU-ZRH once, 737-200.
Sabena's 737s were old looking and a little creaky. Service on the short flight across the pond was fine, if a little impersonal. A soda and a snack. Seat pitch was ok. Everything seemed to run (usually) on time
Transatlantic Y class was another story.
Seat pitch-very tight. The interior of their 747s had worn out by 1986. Very shabby. It was obvious that the company didn't care to spend money on refurbishment. Food was ok. Not as good as LH or KLM. Tight pitch for a tall guy like myself.
Flight attendants for sabena seem to be trained not to care. I think they have to earn their "not caring" certification badge before they can begin work. It's a little badge, like pilot's wings, but in the shape of a hand with the middle finger extended.
Remember, this is over ten years ago. I imagine that the Swissbena partnership and the fleet revitalization have changed the airline for the better. I wonder if it has changed the demeanor of the staff.
"Sympathy is something that shouldn't be bestowed on the Yankees. Apparently it angers them." - Bob Feller