Great review of the latest iPhone*, here: The iPhone 8 is a look into the augmented future of photography | TechCrunch. I had heard that the iPhone 8 had a great new camera, but this article really drives that home.
If you are thinking of getting an “8”, this could be the reason you need. On the other hand, if you rarely take photos or don’t care too much about the quality, I think the case for an upgrade gets weaker.
* I don’t consider the iPhone X the latest phone so much as a promise of where the iPhone is going. To be honest, I think the iPhone X is as much an attempt to celebrate the 10 years of the iPhone and Steve Jobs’s legacy, not unlike the Twentieth Anniversary Macintosh. Not that there is anything wrong with that.