I've been via MUC, FRA, BER, and DUS this week as well as non-German airports and would say that mask wearing continues to be low. Experiences and biases of course vary by user.
It's also more and more rare to see a selection of FFP2 in shops and on Amazon.de. They really are keeping stock very low at this point with only a few items for sale in drugstores. Even the vast selection on Amazon of colours and sizes of FFP2 is very diminished. Clearly demand just isn't there for FFP2 masks in Germany at this point.