What about compared to NY? Also, it might make sense to compare Starbucks in China to a non-us company in the US. Midn you, I understand that PPP does matter (e.g. products imported to both China and USA, such as German cars, will probably be priced lower in China than in USA precisely because of PPP difference), but nonetheless it's just one way of measuring the size of economy, not necessarily the right one.
All other things equal, german cars are going to cost as much in China as they do in the USA because China gets no discount because of it's weak currency, in fact when buying abroad it works against them. They still need to pay the germans just as much hard cash as americans do.
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]