Yes,
In fact we have switched three iPhones over to Samsung. The first switch was from iPhone 4 to Galaxy S6, Second switch was from iPhone 5 to Galaxy S7 edge, the third switch was from iPhone 5 to Note 7.
The camera quality, IP-68, additional storage, S-pen along were more than enough to tip the table. Escaping iTunes and iCloud are another plus.
The Note 7 is my phone, I've had several iPhones and have had problems with all of them. Failed home button operation, cellular antenna failure on iPhone 5, and very poor sound volume and quality on all of them. ICloud and iTunes are horrible and yes iOS can be glitchy, does reboot and has locked up many times.
The switch for us has been positive, yes some things are different and Apple definitely has Android beat on the App front. If your app dependent, Android may not be a fit. I'm sure I'll find things i don't like with Android and with Samsung, but I've had enough problems with Apple that it's time to look elsewhere.
In my opinion Apple has fallen behind on hardware quality, durability and their software integration is no longer head and shoulders above the competition. I would not even consider an Apple phone device based on past history, which has been since the launch of the iPhone 3. Prior to that I had various blackberries and prior to that Motorola star tac.
Pricing was not a determining factor in our decision to switch.