The camera application on the Xperia Z is slow to open. Once you're inside the camera app there's no evident lag or slowdown, but it takes about two seconds to open the camera on the lock screen and about three seconds to open it from the app drawer or home screen. This may not seem like a huge issue but up against other smartphones on the market, the Xperia Z falls short. Given other apps don't have the same issues, we can only hope it can be addressed with a future software update.
The Xperia Z's on-screen keyboard is poor. So far, we've found that the autocorrect system is prone to errors, the gesture input system isn't as efficient or effective as Swype and the default mode lacks full stop and comma keys on the main layout. You can add the full stop and comma keys to the main page by checking an option in settings menu. However, this makes the space bar smaller but keeps the enter and extra symbol keys at a large size which is very odd. Given the stock keyboard on Android Jelly Bean is superb, we have to ask the question: why on earth did Sony replace a great keyboard with one that is clearly worse?
The Xperia Z's screen is exceptionally bright and clear and displays very crisp text but viewing angles are lacklustre compared to many rival models. We don't consider this a critical issue as most people who use their smartphone will be looking at the display directly front on, but other potential users might disagree.
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