http://appleinsider.com/articles/15/07/22/market-watchers-see-buying-opportunity-as-apple-shares-slide-after-june-quarter-miss "Only 12 percent of China has 4G LTE coverage, which gives even more room for iPhone expansion in the nation of over 1 billion people."
After all this time and still a minimal infrastructure for an iPhone there.
OTOH, Chinese are traveling like crazy. I saw whole bunches of them traveling around Greece this month, 99% of them on iPhone 6s. They do like big phones, and they speak not a word of English. One of them here and there speaks English, and they have no interaction with other travelers and locals. It is like a mute, silent crowd going around and taking pictures. I think they are just surveying everything they will eventually buy. LOL