It actually is a igm contract. Base salary + "freiwillige Leistungszulage". Also I haven't had significantly less in my last job (in the last position there). Also a lot of friends (engineers/Maschinenbau mostly) earn (at least) the same. All at around 80k (with a 40h work week) all in my age (i.e. around 3-5 years out of university). And yes, bigger companies.