Quality of food has been quite good, better than the usual Lufthansa Business lounge offering, but of course not on par with high quality restaurants (that can also be found in the airport).
There is always one dish that is cooked fresh for you, in addition to a salad and cake buffet. What sets these A lounges apart from other “short-haul” lounges is their live cooking stations. (Senator is a status in the frequent flier programme of Lufthansa/Swiss) Directly integrated into the normal A lounge is also the Senator lounge, which seems very similar with just a little more space. In these cases I move to the Alpine lounge, which not everyone has discovered yet. That being said, I still find it to be packed with people to the limit more often than not.
More space with nice quiet areas, plus the Swiss interior design. I like both the normal and the Alpine lounge in terminal A, the latter now much more after the refurbishment.