To be honest, there are already plenty of various SGS4 lockscreens but none of them are original and are in some way different from the original one. However, there is one app that is excatly the same as the original Galaxy S4 / Note 3 lockscreen with all the effects, settings and customizations.
Nice, isn't it? These effects are excatly the same and offers the same customizations including ripple effect, lens flare effect, and Galaxy Note 3 watercolour effect. Moreover, there are some extra effects added by the developer so if you like, you can also try them on.
Moreover, the app comes completely for free and does not require root to work! Just install and enjoy!