@M5sime Part of the reason I chose my C350e is that it has Airmatic as standard and it's unheard of to have air suspension in a car that small when looking at 3 series, A4 etc
I had been taken in multiple S class taxis over the years with Airmatic and oh wow, I wanted that "luxurious" feeling in my own MB one day.
However, I want to point out that whilst Airmatic is one factor, you should also look at the combination of tyres/wheels on a car you're looking to purchase, i.e. smaller wheels with relative big sidewalls may also contribute to a softer, more compliant ride and tyres can play a role too. Some tyres are softer riding than others.