Serious question, serious answer: only camera low light and lens upgrades unless you're trying to run last year's AAA mobile games. Arguably no other differences are particularly noticeable -- other than the "always on" screen and mag-safe mounting + charging.

Something you're probably not missing: SIM slots. The new models, in the US, are missing SIM slots.

If you are happy, then no.

My phone feels like a beater that's about to give up on me, and it's younger than yours. I envy long-lasting tech.