Not really - China is very English-friendly, particularly in its business centres. Of course EU countries generally are as well.

Only in the main cities. Just outside the boundaries, and you will face some language barriers. Language barriers also with small to medium businesses interaction.

To be honest, it is not just a language barrier, how about cultural barrier and others.

Where in China have you visited? Did you venture outside the main touristy areas?

Business, rather than tourist areas. And no. Though I understand that English is a mandatory language in schools now.