The performance on the Xperia Z is next to unparalleled. The only device that even comes close is the pure Android experience on the Google (but LG-made) Nexus 4. The Xperia Z is stellar, both in real-world use and in benchmarks.
I used it as my primary phone for a little under two weeks, so I could get a great feel for the phone. This is why we don't do smartphone reviews every three days, because else it is too formulaic - there needs to be a 'real-world' feel, and then a 'real-world' opinion - which is why I don't like the word 'review' for smartphones.
Let's move onto some images from the camera. Here are some examples of the quality of the camera:
And a few panoramic shots:
And now for some video samples:
Now let's get into some of those benchmark graphs!