Hard to say while it is still spreading, but there are some data points which might explain the relatively low fatality numbers so far(though they are still going to be horrible). In terms of testing, 'we' appear to be more active than the other European countries, according to Politico() 200k test are done each week, compared to ~300k tests in Italy and ~90k tests in the UK so far in total. According to Prof Drosten, head of the centre for virology at the Charité, Germany has several advantages in regards to diagnostics, equipment and personnel with the necessary knowhow. Furthermore, Germany has more critical care beds/capita than the other european nations(
https://i.redd.it/0fs0pfeocrm41.png) with roughly 29/100k compared to ~13 in Italy and ~6.5 in the UK(it is split between the 4 British nations, so that number may be inaccurate). Luckily, there hasn't been a case of a doctor being forced to decide who is going to be ventilated so far and some Italian and French patients were flown in to alleviate the stress on their health care system, it will still be rough for all of us.