I already knew this from owning a Lumia 1520. Trust me when I say the iPhone 6+ is a lot bigger than people realize right now. And the pocket thing is very valid. It can be a real PIA!
Seeing that's made me think about changing my mind and getting the 6 rather than the 6 Plus. Simply because of the pocket test, I wear jeans and need my phone to be able to go into my pocket comfortably.