Update for iOS 8.1.2 requires 5.6 GB on iPhone 5S?

I'm currently running iOS 7.1.2 on my iPhone 5S and my iPad 2.
Is that 5.6 GB number really correct? That's pretty big on a 16 GB phone. Since my total user storage shows 12 GB, is iOS 7 consuming the bulk of that 4 GN difference, and I'll get that back after the installation? Or will the OS consume that 4 GB plus the 5.6 GB it's telling me it needs for a total of 9.6 GB out of the total 16 GB? That's 60% of the total. That sounds like a huge chunk to me.
Curiously, my iPad 2 was only telling me that I needed 2.4 GB. Is iOS 8.1.2 twice as big for the 5S phone as it is for the iPad 2
What's the story here?

1. Yes. It accounts for both the compressed and decompressed versions of the update.
2. Most of the space required will be free once the update is complete. If desired, update it from iTunes on the computer; most of the temporary files will be stored there instead of on the device.
(118186)

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