The Samsung Galaxy S4 Active is an Galaxy S4 with an IPS screen, lesser camera, larger bezels, physical buttons, and who knows what else has changed. its hardly an S4 anymore.
There’s a good chance the display is even sharper than the one in the regular S4.
the regular S4 has a pentile amoled screen, but I recall reading somewhere that the active has an LCD screen which most likely has the standard RGB layout.
I think this phone can actually make more people swim regularly :)