I had the 5S for a few days and compared available memory with no apps running in the background. The 5 had about 52% percent available while the 5S memory was around 35% available. Both had the same apps installed and nothing running. The 5 is running IOS 8.1 and the 5S was running the latest version. Also the 5 is jailbroken. Just a bit of information for you all.