Someone commented once that the quality level is almost the same these days in bikes. And I wouldn't be surprised if a lot of bikes are made by some of the same manufacturers. This is because the last time someone asked about getting a bike, when I decided to look at 26 inch wheel comfort bikes, I found nearly all of them I saw on many different sites like Trek, Giant, Cannondale, GT, etc. all had threaded headsets and ajustable stems.
I know I saw Corratec frames once on amazon but if you're looking for something German, there's also Ghost at mec.ca
Some German bikes are really cool because they have fenders, chainguards, dynamo lights and sometimes backracks. If I had my own bike company, that's what I'd want to produce. And I'd even produce them with metal friction shifters.