I have iOS 8.2 on my 5S and one of my 5 phones (personal vs work devices)
I have 8.1.3 on my other 5 (this is my international phone, banged up quite a bit)
I have 5.1.1 on my 4S (a gift, and brand new still) and even older 4 (jailbroken, my glorified backup/iPod touch 😉)
Intrigued by how 8.3 will work on the 5