Which is Better Sony Xperia Z or iPhone 5?

I want to buy a new phone, but I'm confused. Xperia Z has quad core, android JB, 2 GB ram, Full HD display and 13MP camera.
Iphone 5 has dual core, ios6, 1GB ram, decent display and 8MP camera.

i heard that Xperia z screen and the camera quality is not good. And iPhone 5, i'm new to ios, previously i was an android user, and pretty much i know how the OS is. But ios, i don't have an idea. Please suggest me a good phone and tell me why it's good than the other

Without any question, you can buy iPhone 5.

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