With 3 iPhone 5's and 1 GS4 phone in the house, none of the users of any of the devices have any desire to change.
I cannot imagine any scenario where I would trade in my GS4 for an iPhone. My techy daughter went with the iPhone simply for the apps. But I suspect she secretly wishes she had gone with the GS4 instead. The other 2 non-techy family members are happy using their iPhone 5's.
All is good in our mobile family.