If you want a nice apartment, nice safe food, decent education for your kids, a car, medical care, you've got to pay more dearly for it.
The advantage PPP gives poorer countries is that goods that depend on domestic labour, which is very cheap, get to be equally cheap. Any goods or services that don't depend on that cheap pool of domestic labour don't get that benefit. German labour in Germany isn't cheaper to buy in China than it is to buy in the USA, so PPP is irrelevant.
As an aside, German cars are actualy vastly more expensive (up to 2x or 3x for high end models) to buy in China than in most countries due to severe import taxes, but the base cost of buying the car from Germany to ship to China would be about the same.
[Re. Some BMWs made in China - in which case they're not really German cars]
When we are looking at the largest economy in the world, we are looking at world wide numbers and as an American or European most of China is going to feel very cheap.