http://www.laptopmag.com/reviews/smartphones/google-nexus-6
A lot of people are happy to see an iPhone update.
http://techcrunch.com/2014/11/15/most-people-prefer-the-iphone-6-but-the-6-plus-is-selling-ok-says-analyst/?ncid=rss&cps=gravity
Of course, the Android phones are updated with more features on a regular basis.
http://laptopmag.com/reviews/smartphones/samsung-galaxy-note-edge
The curved phone has its niche.
http://www.laptopmag.com/reviews/smartphones/lg-g-flex-tmobile
Some people use battery life as a motivating choice factor.
http://blog.laptopmag.com/smartphones-best-battery-life
http://en.wikipedia.org/wiki/Comparison_of_smartphones#Hardware_and_OS