I partly agree with you. From a sport perspective I think top European clubs would be the best for KHL, but from a market perspective I think China would be better.
And it's because I think like this: If 1% of the Chinese population would find ice hockey interesting, this is 13 million people. And if 1% of them lives in Beijing, that is 130 thousands. And if just 1% of them would support a Beijing team in the KHL(become fans) that would be 13 hundreds.
The last figure of just 1 300 fans might not sound like much, but that number is actually higher than many teams in Denmark, France, Norway and other "middle" high league teams has in Europe. Countries with national teams in the WC.
And let's say that less than 1% of China felt interest in the KHL, that would still be several millions of people. Could be more viewers than the whole population of Sweden or Finland.
So from my point of view a great market for the KHL.