Not entirely comparable. Most universities don't have tuition fees in Germany, the highest fees are 1000€/year, while it is estimated that the costs of educating a medical student are at least 30,000€ / year. Basically the education is heavily subsidized by the German taxpayer, so if a huge number of doctors later work and pay taxes in Switzerland it is somewhat suboptimal.

Ok, so the real problem is that Germany is forcing it's citizens to subsidize doctors and the Swiss, rather than that the Swiss are freeloading.

The obvious solution (for Germany's citizens, if not their politicians) would be to charge market rates for medical education.