Phones haven't quite reached the point that desktop computers have. With a desktop, a 5 year old machine today is still completely useable even with the latest software. Meanwhile, a 5 year old phone is the original iPhone. This generation of phones might be the beginning of that era, but the increased performance in phones is still enabling new features that weren't possible before (full res burst with image evaluation, 120fps video editing, etc).

If it's true that the iPhone 5s of today matches or exceeds the performance of a laptop from 5 years ago, that could mean we're not long away from full-featured convergence devices (plug your phone into a monitor+keyboard to turn it into a complete PC)