Having owned a Nexus 4, it is really no comparison to the build quality of an iphone 4/5. It has amazing innards and the best mobile OS, but the case is cheap and fragile.
I've dropped my iPhone 4 dozens of times and it never broke the back. I dropped the Nexus 4 once and it cracked all the way down the back of the device.
Nexus 4 is still a great device overall (especially for the price), but the iPhone build quality is seemingly worth the premium.
This kind of comment really brings down the level of discourse on this site. If the Nexus 4 is cheap and fragile, then the iPhone 4 is broken, cheap and fragile. They are built with the same materials, but the Nexus doesn't suffer from the embarrassingly bad antenna design of the iphone.
While this is somewhat subjective, you cannot be talking about the Nexus 4. There is nothing cheap about its case. And this is somewhat bizarre when we're talking about a device that you've never touched (the iPhone 5c), which we already know is made of the much reviled plastic.
I think it's a safe assumption that the 5C/S will be at least as solid as their predecessors.
I owned an N4 for a year. I replaced the back and front glass on it. I have two kids, and my iPhones have suffered no end of abuse - with very little damage. The Nexus on the other hand - I barely knocked it against a table and the back shattered. I dropped it a few inches onto my work desk, and the front shattered. Taking it apart, I could see firsthand how flimsy and thin the case and glass are, especially the back. This is well documented on the web.
Granted it's my own little anecdote. I still think it's a great device otherwise - Android flies on it, and I far prefer Android to iOS. I doubt I'll buy another iPhone again no matter how nice the hardware is.
I own a Nexus 4, and there is: the backside. It scratches very, very easily. Plus (even though this is anedoctal), it appears to crack just as easily if dropped. That was absolutely not the case with my old iPhone 4.
