If I am not mistaken, this has been the case on a few acquisitions in recent times. China was the last country to give regulatory approval to TI's acquisition of National Semiconductor. I agree that it is mostly likely due to bureaucracy, but perhaps China really does take a harder look at these than other countries?
"On September 19, 2011, the Chinese minister approved the merger, the last one needed. The companies formally merged on September 23, 2011."
It's interesting, though, China actually was the last country to approve this merger. Authorities of all the other countries had already given them a green light.
But of course, it doesn't necessarily mean that China has a tough anti-trust policy. It probably tells the story of China's bureaucracy more than anything else.