Yes, it's easier to insult Hitler than Erdogan in today's Germany, but don't worry, nothing will happen, and no one will be sent to jail. Erdogan's critic on press' freedom has brought major news coverage in Germany, with several members of the parliament defending free speech in Turkey, so it cannot get worse in Germany.
http://www.businessinsider.com/r-germany-says-press-freedom-non-negotiable-in-talks-with-turkey-2016-3?IR=T