All these phones claim to have 16gb memory. But as Which discovered and many of us techies will know the story is not quite that as each phone uses part of the memory for the firmware and bloatware. But what stands out is the Samsung S4 will just over half the memory only free!
Gavin's Gadgets & Photography 
That is an excellent image Gavin. Makes it much easier on the eye in identifying the culprit.
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What’s doubly annoying is that, unless you’re rooted, system apps get duplicated and you lose even more space. Google really need to get a handle on this.
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