I've never had the need to buy an iPhone, as the Mrs has always had one, and indeed now has the 6s. I can't say I notice much difference between the 5s and the new one other than the screen size, and the fact Safari doesn't constant need to refresh web pages. There us the obvious styling differences, thinner etc, but it seems the same, same OS with a few tiny tweaks for force touch etc.
Having forked over £619 for it, versus the absolute bargain Nexus 6 I got from Amazon for £143, I certainly wouldn't say there is no comparison in value for money.
Certain people will no doubt argue that costs are irrelevant, and this only seems to be when discussing phones and laptops etc. Any where else in life value for money, along side function and form are almost measured equally.
There is no where near 4x the function, versus the cost for me, and the £450 saved will stay in the bank or invested earning interest.
Everyone has their own ideas of what is good, and that is what makes for a great debate, for me I love the Nexus 6, and can't really find fault with it presently.
Kind of when off a bit, but you get the idea, great phones bad value for money.