I've had an iPhone 6 since launch and I still long for an iPhone 6 spec phone in an iPhone 5/5S sized body. If I pick up and use my 6 for a while, I quickly start finding my hand is aching from all the stretching and over-reaching required to access all elements of the display. It's got to a point now where I have to hold the phone with my left hand and interact with the screen with my right hand to avoid the aching from single left handed use.
I had the same issue, which why I want 4" iphone.