The Sony Xperia Z was the company's flagship handset from earlier this year, and while its Full HD screen and 13-megapixel camera ticked the necessary high-end Android boxes, we weren't so keen on its hard plastic edges and slab-like design. Surprisingly, considering that the Z has only been on sale for around six months, Sony has now launched a successor - The Sony Xperia Z1.
It looks similar, with its square edges and glass front and rear, but the frame is now metal instead of glass fibre. This is cool to the touch, and makes the phone significantly more comfortable to hold than the Z, as well as better-looking; we particularly like the version with the white rear. Like the Xperia Z and Tablet Z, the Z1 is also waterproof; it will cope with 30 minutes immersed in fresh water at a depth of up to 1.5m.
CHIPSET AND BENCHMARKS
Sony has also taken the opportunity to cram some more power into the Z1. While the Z made do with a 1.5GHz quad-core Snapdragon S4 processor, the Z1 has a 2.2GHz quad-core Snapdragon 800 - a true monster of a chip. The phone completed the Sunspider JavaScript benchmark in 767ms, which is the fastest score we have ever seen from a phone. The handset was even too fast to get a measureable score in the 3DMark Ice Storm benchmark, where we saw a 'maxed out' error. Once we switched the benchmark to Unlimited mode, we saw an astonishing 17,551. The only phone we've seen that was faster in 3DMark was Samsung's Galaxy Note 3, which managed 19,093.
All this power certainly translates into real-world performance. Real Racing 3 was beautifully smooth, so demanding 3D games aren't a problem, and we can't imagine Android being much slicker. Apps open and close quickly, and home screen transitions are beautifully smooth. Complicated web pages render quickly, and there's barely a hiccup when flicking around past large images; there was none of the hesitation we see on many Android phones, even powerful models such as the LG G2.
DISPLAY
The Sony Xperia Z1 has a 5in, 1,920x1,080 display, which is currently de rigeur for a top-end smartphone. At first we felt the Z1's screen looked a little cold when compared side by side with a Samsung Galaxy S4's panel, but on closer inspection the Z1's IPS display has more accurate colours; the S4's AMOLED screen has a very slight yellow cast.
As expected, blacks aren't as deep as on the S4 or the G2's screen, but we feel the Z1's pure whites make up for this, and the screen is easily bright enough to read on a sunny day. There have been some comments about the Z1's screen having narrow viewing angles, but seeing as we always use phones facing the screen straight-on, it didn't bother us. The only problem we had with the Z1's display was that something about its surface coating attracts pocket dust.
CUSTOM ANDROID
The Z1's version of Android is fairly heavily customised, but as with all Sony's current handsets, it's classily done, with some tasteful custom icons and a preference for sombre colours over the brash primaries of Samsung and LG's handsets. There's a fair amount of Sony software installed, which mainly serves to sell you Sony content , but it's easy enough to remove if you're not interested in buying music and videos from Sony's services. Out of the box the X1 has around 12GB free for apps and files, and you can add more space with the microSD card slot.
We like the home screen management. A long press on a vacant bit of screen will show you a carousel of your homescreens and let you move widgets and icons around, while the bottom-third of the screen contains the apps and widgets to drag and drop on to spare Desktop space. It's a neater system than the stock Android app tray, split into apps and widgets.
CAMERA
The Xperia Z1 has a camera with a headline-grabbing 20.7-megapixel sensor. The only phone we've seen capable of capturing more pixels is the amazing Nokia Lumia 1020, but Nokia's handset has a bulge on the back to hold the camera assembly. Also, while the 1020's sensor is a big 1/1.5in model, the Z1's is a compact camera-style 1/2.3in. This is still bigger than the sensors in most smartphones, including the iPhone 5S.
The Z1 doesn't take 20-megapixel photos by default. During our testing, we found that if we left the phone in Superior Auto mode, it would always produce 8-megapixel images. This is because, like the Lumia 1020, the Z1 uses oversampling. This is the process where the phone uses the large amount of information from the sensor to pick what it feels are the most accurate pixels, discarding those it deems inaccurate to form a smaller 8-megapixel image.
Things aren't much better in daylight. The Z1's photos (top) look flat and indistinct compared to the competition, and when you zoom in, they descend into a mass of noise - click to enlarge 
In low light the Xperia Z1's photos (above) show blurry details and excessive noise, and compare poorly to the LG G2's images (bottom) - click to enlargeUnfortunately, we weren't particularly impressed with the camera. Even with oversampling turned on, our low-light photo test was noisy with blurred details; images were significantly worse quality than the LG G2's photos, and a world away from those we saw from the Nokia Lumia 1020.
In daylight, we weren't blown away by either the full-size or oversampled images. Full-size images resisted pixilation for longer as we zoomed in, but as the image descended into a blurry, noisy mess, this was hardly an advantage. Images showed accurate colours and resisted the overexposure so common to smartphone cameras, but blurry edges and fuzzy details are not something we'd expect to see from a high-end smartphone.
CONCLUSION
The Sony Xperia Z1 is a definite improvement over the Sony Xperia Z, but smartphones are still improving rapidly and it's actually lost ground the competition in the intervening six months.
It's quicker and has a more pleasing design, and we like the screen and Sony's Android customisations. However, it's let down to earth with a bump by its disappointing camera, which is miles away from the competition for quality. The Nokia Lumia 1020 is still the ultimate cameraphone, and if you're after an Android handset the LG G2 (review shortly) takes far superior photos.
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