How much?
You're buying the name. Apple is as much an marketing company as Google is an advertising one.
I'm a committed Android user but had a play on a colleague's 6 today. I will say it's a really nicely-built handset and the screen is wonderful. I can't knock the hardware and, it might be (to me) restrictive but the software works well too.
But is it really any better - really - than a top-end Android phone? Both make calls, send texts and emails; both run the same batch of common apps; both attract desperate fandom; and both are now mature products.
So considering my 32GB LG G2 cost me £279 recently - a hypothetical 32GB iPhone 6 would come in at £579 - I think I can safely say you're paying through the nose.
But what it all comes down to is this: another colleague saw my LG recently and laughed. "LG? Don't they make washing machines?" Yes, they do. And tellies and probably deep-fat-fryers. But they also make a decent smartphone that does all yours does, love, for less than half the price. (And my battery lasts 2+ days; last night was at 28% after two days' unpluggedness.)
Some iPhone users will come round at some point. I was the first person of everyone I knew to get an iPod and have had several; for some reason the allure of the similarly-monikered phone escaped me. (Actually no it doesn't. Now I think about it that reason was iTunes, and a chill runs up my spine. Scared/scarred me for life.)