Sony Xperia XZ2 Premium is the heaviest high-end phone of recent years
According to Sony, the US variant of the Xperia XZ2 Premium weighs 8.2 ounces, meaning 232 grams. We've searched hard for other high-end phones that could match the new Xperia in weight, but didn't find any - at least not among the handsets that are relevant in 2018. After the Sony Xperia XZ2 Premium, the second heaviest high-end smartphone on the market is the rugged Samsung Galaxy S8 Active, which weighs 208 grams. A close third is the Apple iPhone 8 Plus at 202 grams.
Like the regular Sony Xperia XZ2 (released some months back), the XZ2 Premium is made out of an aluminum frame sandwiched between curved 3D glass. Because of its curved back, at its thickest point, the phone measures 11.9 mm - that's a lot for a modern handset. The 5.8-inch 4K display, the 3540 mAh battery, and the advanced dual rear camera, among other things, all add to the device's weight.
If you're coming from almost any other phone (since most models weigh under 200 grams), you'll definitely notice the extra heft of the Xperia XZ2 Premium in your hands. Of course, if you like the XZ2 Premium and all the features that it's offering (and there's plenty to admire in this regard), the unusual weight is probably not a deal breaker. But it's still something to take into consideration if you're seriously thinking of buying the phone.
reference: Sony Mobile USA