I did the same... I'm coming from a nexus 5 to iPhone 6 nothing to complain about android... Just want a change and I can say I'm enjoying my iPhone 6.... 2 years ago before android I had a iPhone 4 an 4s ...
Just go for it mate... Buy a iphone 6 and you will be happy. I was 2 year with Android nothing to complain love android but just got a iphone 6 and my Nexus 5 gone already... I did just to try something different both os are excellent. People that say different are fanatic :) ios and android...