Why you should upgrade your phone already.
If you have an IPhone 4 you are most likely experiencing planned obsolescence. You are running out of space. Your Face Book app crashes at least 5 times per day. You often yell at your phone displaying websites slowly (perhaps to the point of "Can you believe this page has been loading since I started going to the bathroom?". No one wants to hear that shit.)
5S v. 4
Screen: 1136 x 640 vs 960×640
4 inch vs 3.5 inch
The screen of the 5 looks better.
Apple A7 vs Apple A5
The A7 will run about 5 times faster. That is very noticeable.
4G LTE vs 3G
This is major. The new phone will make you angrier at your old phone for wasting so much of your time.
Actually you probably won't notice much difference.
Lasts about a day, charge it at night.
8 Megapixels (nice quality) vs 5 Megapixels (not so bad quality)
There is a difference. If you only shoot selfies, not so much.
Get a new phone already! You know who you are... I get very annoyed by your constant complaining about the IPhone 4.