The iPhone 6 Review
 

With every launch of the iPhone, Apple seems to have everything to lose and not much to gain. Apple’s iPhone line accounts for the majority of profits in the smartphone space, and as the smartphone market marches towards maturity it seems inevitable that companies like Xiaomi will be able to deliver largely similar experiences at much lower prices. The same was once happened with Apple in the days of the PC industry where Apple approached irrelevance. Yet generation after generation, Apple seems to be able to hold on to a majority of the profit share, and they’ve managed to tenaciously hold on to their first-mover advantage.

http://www.anandtech.com/show/8554/the-iphone-6-review