You have problems with 4.3?
It's incredible how people aren't satisfied, ever...
Wait and you'll get your KitKat...Sony is actually building their UI, it's not only cheap mask over Google framework - that's why they need time.
Wen you get KitKat you'll request another version...or you'll open thread to request root for kitkat...
Relax, you still have almost one whole year of support and everything will come and be released on time.
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Do you really think that getting the update 5 months later is acceptable? It's not like we're getting a new UI with sony's implementation of kitkat, we should actually , I don't understand why reasonably demanding for things, makes us a**holes, should we just keep quiet and be content with what companies give us? How do you think HTC and Motorola updated their game ? By listening the the users complain , they want our money? They'd better work for it!
I see we're all going crazy about the specs of the Xperia Z2, but no one here appears to be concerned about how slow sony is to roll out updates, Kitkat 4.4. was released on the 31th of October, and the Xperia Z1 , sony's current flagship still hasn't got it :/ ... 4 months after the release , they plan on delivering the update on April, 5 months, maybe 5 and a half months after 4.4 was really released and they're not making any promises of improving, what do you guys think?