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I almost didn't grab a 6 because my 5 was so fluid. Almost. I just really wanted that camera and Touch ID. I went a day using just my 5 and I didn't miss anything speed wise, just Touch ID and Camera.
 
I have a 5C, my father has a 6, I've played around with in and in general day to day use I wouldn't be tempted to buy one. My 5C seems as fast. OK touch ID would be nice but no big loss really. I also prefer the 4" screen. I had an S5 didn't like the size of it.
 
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