The Trend in museums is to have high end restaurants, and the Franz Marc's restaurant is a fantastic example of it working well.
The staff has limited english, and were not able to offer much help with the menu. We ordered based on a few words we recognized. The food was consistently delicious and well prepared. This was all enhanced by by a spectacular view across the lawn of the museum to the valley (& maybe the lake, I cannot quite recall).
Definitely worth planning your museum visit around a meal!