Introduction
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Ever since the Xperia Z, released last spring, Sony adopted a six-month upgrade cycle for its flagships, issuing the Z1 in the fall, and this spring it outed theXperia Z2. Despite the bi-annual upgrade schedule, Sony significantly improved the Z2 over its predecessor. Although it's thinner and lighter, the new heavyweight boxer features a larger, better 5.2-inch IPS display, a larger battery and faster chipset, paired with the generous 3 GB of RAM. Its 20.7MP camera on its back is capable of 4K recording, slow-motion video, and adding real-time effects now. In addition, the Z2 one-ups the Z1 with a stereo speaker set, as well as noise cancellation, plus a few more software and hardware extras.
These are the dry facts about the upgrades that happened between the Z1 and Z2, but is their performance level all that different? Let's dive in for the nitty-gritty details in the fight between the six-months old Z1, and its overhauled successor the Z2...
Design
With a very similar waterproof chassis, the Z2 still feels more comfortable to hold and operate.
Measuring at 0.32” (8.2mm) thickness and 5.75oz (163g) of weight, Sony's newest flagship is a tad thinner and narrower than the Z1 predecessor, and it's also a bit lighter. Of course, that 0.2” larger display diagonal had to go somewhere, so the Z2 is slightly taller than the Z1. The Xperia Z2 is still crafted in the best traditions of Sony's OmniBalance design, with glass front and backplate, clasped into a sturdy one-piece aluminum frame, exuding a premium feeling.
Both handsets offer a rectangular unibody chassis with IP58 waterproof certification, sealed battery, and all the ports and slots on the sides are covered with protective flaps. The IP58 tag means that they can stay in up to five feet (1.5m) of water for more than an hour, so you'd have no issues using them in the rain, the shower, or even in the bathtub. The corners of the Z2 chassis, however, are a tad softer than the Z1's, and the sides are more tapered, so it feels a bit better in the hand. The round metallic power/lock key, the volume rocker, and the shutter keys on the phones' right sides are all easy to feel and press without looking, and offer good tactile feedback. The protective flaps over the SIM and microSD card slots, as well as over the microUSB ports, however, are a bit of a nuisance to pry open on both the Z1 and Z2, especially with trimmed fingernails, but that's the price to pay for being able to dunk the phones in five feet of water.
One of the significant differences between the Z1 and Z2 is that Sony graced its latest flagship with stereo speakers and amplifier set, dubbed S-Force Front Surround Sound. They are located at the top and bottom of the handset, making it one of the only handful of smartphones with a stereo speaker combo.
Technology

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