To be honest, iphone 12 felt like a big jump in ergonomics due to big redesign and iphone 13 pros had biggest battery life and promotion coupled with high OS stability. In comparison our 14PM upgrade was kinda meh except 5g and 4g speeds.Most iphone updates are iterative. Some are extremely good iterations even transformative, as noted below, but they all are iterative. (I don't consider usb-c anything more than what it is - a connector, unless like Apple Pay, Apple does something innovative with it)
- iphone 4s: is the embodiment of the iphone future
- iphone 5s: touch id
- iphone 6: bigger iphone and apple pay
- iphone X: face id
- iphone 15: ?
Hopefully iphone 15 will be decent update.