The Android Lollipop (5.0.1) update is pretty heavy, as it is 1049 MB.
A lot of changes are present. We have already seen what has changed from the previously released preview videos by Sammobile. It has a similar look and feel to touchwiz, but has Lollipop design aspects all over. According to the Source, the Battery Life and Performance should also be better.
I already made a Video tutorial on how to install the Lollipop Firmware on to the Galaxy S5, but the steps are the same so you can follow that by using the Galaxy S4’s Firmware.
The other varients of the Galaxy S4 will also see the update pop up soon. Now 3 Major Flagships have got the Lollipop update, but the Note 4 has still not got the Lollipop Update. It is said that this is to do with the Gear VR, and the Update will land soon. Stay tuned to Andro Dollar to know when it hits the Note 4 as well, and share this with your buddies with the Galaxy S4.