Wikipedia editors are pretty strict about what gets to remain a page. Everyone knows they delete articles unless it has lots of sources and public interest.

With 6x the articles on baike I can't imagine that there is that level of quality control. Unless there are 6x as many things worth documenting in China vs rest of the world.

An interesting statistic none-the-less.

English Wikipedia has 5.4 million articles. I imagine many of them would be notable in Chinese too.

Baidu Baike has not changed its portrait of bad quality/credibility issue/plagiarism from my memory.