THE XPERIA Z4 is official, with Sony having unveiled the flagship device at a low-key event in Japan.
Despite expectations the firm would be gearing up to take on the Galaxy S6 with its latest release, Sony's Xperia Z4 is largely similar to its predecessor. However, it arrives packing an more powerful 64-bit Qualcomm Snapdragon 810 processor, Android 5.0 Lollipop and a thinner and lighter design.
We've rounded up everything we know about the Sony Xperia Z4, and be sure to keep this page bookmarked as we'll be updating it as soon as we hear more.
The Xperia Z4 was widely-expected to make its official debut during Sony's CES press conference in January, but didn't, which fuelled rumours that it would instead launch at Mobile World Congress. It didn't.
However, as rumours had since suggested, Sony unveiled the Xperia Z4 at an event in Japan on 20 April.
While the Xperia Z3 went on sale mere days after its official unveiling, Sony has announced that the Xperia Z4 will go on sale in Japan this summer. There's no word yet on a UK release, but Sony tells us that it is "considering the feasibility" of releasing the handset in other markets
It is not yet clear how much the Xperia Z4 will cost when it goes on sale. However, if it's priced like last year's model expect to pay around £515 for the smartphone SIM-free.
Despite Sony telling The INQUIRER during an exclusive interview that it skipped an MWC launch in order to make sure its next top-end phone is "innovative" and full of new features, the Xperia Z4 is largely similar to its Xperia Z3 predecessor.
The device features the same 5.2in 1920x1080 HD display as the Xperia Z3, which perhaps seems pale in comparison to the QHD screen found on the Galaxy S6.
Unlike Samsung's flagship smartphone however, the Xperia Z4 boasts resistance against both water and dust, and while it looks largely the same as last year's model with its metal and glass casing, Sony boasts that it is thinner at 6.9mm thick, and lighter at 144g.
It's also shinier than the Xperia Z3, according to Sony, and will be made available in white, black, copper and aqua green versions.
The Sony Xperia Z4 packs an upgrade under the hood, with the handset touting a 2GHz 64-bit octa-core Qualcomm Snapdragon 810 chip, paired with 3GB RAM. This processor also comes optimised for the handset's Android 5.0 Lollipop software, which comes with Sony's custom user interface on top.
This equips the Xperia Z4 with Sony's own Walkman and Video apps, along with the firm's augmented reality camera features.
Much like the Xperia Z3, there's a 21MP camera on the rear of the smartphone. However, Sony has added optical image stablisation - much like that found on the iPhone 6 Plus, which should make for sharper, less-shaky images.
The front-facing camera has also seen an upgrade, being bumped from 2.2MP to 5.1MP.
Beyond that, the Sony Xperia Z4 boasts 32GB included storage expandable up to 128GB via microSD, integrated Bluetooth 4.1 connectivity and a 2930mAh battery, which Sony claims will offer 17 hours of talk time.
There's no word on battery life yet, but the smartphone is expected to support Qi wireless charging. If anything like the Xperia Z3, it will also come with quick charging support which can juice the handset to 60 percent in just 30 minutes. µ
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