Check this out:
https://forums.androidcentral.com/e...et.nurik.roman.dashclock&hl=en&token=onXKKzGG
The S4 runs Android 4.2.2, which supports awesome customization and multiple screens on your lock screen, unlike pre-4.2 versions of the OS. DashClock is a brilliant third-party lock screen customization that is compatible only with Android 4.2+, and has a ton of built in extensions, as well as third-party extensions. The stuff you can do is pretty cool, and the extensibility is great. With 4.2, no need to run lockscreen replacements like WidgetLocker, which can sometimes behave a little funky on certain phones.
A lot of reviews don't get into this much, but running 4.2 is a pretty big advantage that the S4 currently has over the HTC One (which is running 4.1).