I am curious about your experience in Germany.... 'Germany hasn't been great to begin with, usage rights in particular' what is it that has been underwhelming for you?
Well, in other European countries and the US my fees are usually 2-4 times of what I can get in Germany, and usage rights hardly ever get paid anymore, or only little .
Don't get me wrong, I still enjoy my work wherever I am, and whatever they pay me, but German agencies tend to treat photographers worse than those in other places I know.
Also, some of the larger clients have developed policies that can actually ruin you if you accept certain assignments and payment schedules .
The best market is where you have your network of contacts. Things are already competitive enough without moving to a new country and having no client network at all.
If you're looking for a magical place where there are no photographers and they're prepared to pay high rates, I think you'll be looking for a long time.
I don't really have a steady client network, it's more about my agent's network in my case .
As for 'magical' place, give me some credit - I'm not that naive ...

I just had to sign up to LL to comment on this post.
I have been working in Hong Kong for the past 10 years.
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Thanks very much, Jonas, that's valuable information !
I've been told about the role of production companies in (parts of ?) Asia , and that they actually are crucial for assigning jobs to photographers .
Is that correct ? If so, how do you approach self-promotion ?
... I am at least very much looking forward to the adventure and inspiration that comes with relocation.
Good point .