I would have said 6 or 7 if asked. It seems like a lot has happened in that 5 years. The thing that strikes me about the iPhone, and everyone has their own thing, is this contradiction. For me upon it's release it was so revolutionary. It was such a massive monumental change from its closest rival (Blackberry) in the way it looked, felt and worked. Since that time though, it really has done some small iterations and…
Take siri for example. Apple is running a ton of celebrity ads just to show people how to use it, because siri is too different for the average person. Luckily for Apple, its just a feature, not the core product. Just like a new Android device, people will get used to siri eventually. The difference is the iPhone consistency makes the essential phone experience seamless.