I think I'll jump in on this. I think the iPhone 6 feels analogous to the Nexus 5. I haven't held them side by side, but honestly the 4.7" is not noticeably different, IMHO. The 6 feels like a higher quality build Nexus 5 in the iOS operating environment.
If you're on the android/iPhone fence, I would seriously wait around for the 2014 Nexus 5 (that appears to be the rumor now) and see if you like it. Either that or wait it out for the 6S.
Also, as goofy as a lot of us thought it was, the double tapping the home button to drop the screen down works and is quite convenient to reach the far corner of the screen.
Yep. The double tap option is crucial.