You can now install the official Galaxy S4 Lollipop firmware, but only if you've got the GT-I9506 model

If you own the older, GT-I9500 or GT-I9505 model, you can either sit tight or hunt down the firmware image that is already seeding in Russia. If you decide to be patient, it probably won't be long until you get it anyway – OTA updates usually work in phases. So, as long as no critical issues pop up, it's only a matter of time until your Galaxy S4 gets the new goodies. Users with carrier-branded GS4 will almost certainly have to wait longer, though.
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source: Samsung-updates
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