I was deciding on this or the Pixel 2 and I am definitely happy I went for this. The phone is very responsive, the finger ID is excellent, screen quality is great, recording videos is great, I am just a very happy customer who will probably stick to Sony mobile phones from now on!

What defines a premium product? To my mind, it's the added benefit or advantage of something that you wouldn't be able to obtain at a lower price. An example might be the $4,000 Focal Utopia headphones with beryllium drivers, whose sound is hard to rival and unobtainable without that extremely rigid...

Bright; pixel-dense display; Snappy performance; Good battery life

Underwhelming camera; Unergonomic design; Display bezels are huge by 2017 standards

Well this is my third xperia and it's by far the best. This replaced my Z3, so it was a big jump in performance. They screen is awesome, especially watching video, and jaw dropping in 4k.

The Xperia XZ Premium is a glorious return to the flagship segment. While the headline grabbing features, such as the super slow motion camera, have, let's say, limited usefulness, the phone behind them is very competent.

Sharp; colourful screen; Solid build; Fast

Massive horizontal bezels; Expensive; Camera poor in low light

The Xperia XZ Premium is surely one of the best smartphone from Sony in recent years. It offers a future-proof 4K screen, which is ideal for VR apps. Its multimedia performance is great. In good lighting conditions, the camera is good too.

The problem with smartphones is that they need to stand out from the competition and sadly there is very little that compels me to go out and buy an XZ Premium.

The Sony Xperia XZ Premium is the best 4K smartphone out there. That ultra-high resolution screen is pointless, and the handset is somewhat bulky, but it's hard to deny that it looks very good.

Many people are loyal fans of the Sony brand, not just for their smartphones, but for their televisions, displays and image processors and sensors for cameras of all types. The Sony Xperia XZ Premium is the technological essence of almost all these areas.

High-quality manufacturing; Slow-motion recordings up to 960 fps; Very good performance; Good camera

Design; Software still needs improvement; Lacking content adapted to hardware

Sony's televisions and game consoles are incredibly popular, but its smartphones? Not so much. So the company went back to the drawing board with this year's model. The result, the $800 Xperia XZ Premium, combines the best of Sony's Bravia TVs and its PlayStation console.

Gorgeous 4K HDR display; Bright screen shows off lots of colors accurately; Solid front- and rear-facing cameras; Powerful performance

4K content is limited at this stage; No fingerprint sensor; So-so battery life; compared to other flagships; Super-slow-motion feature feels like a novelty

This is Sony's headline phone for 2017 and, as you'd expect, it comes with all the top specifications. Like Sony's previous flagship, the , there's a 5.5-inch screen with 4K resolution and HDR (with a caveat, mind), and a Snapdragon 835 processor that can give rival handsets such as the , and a run...

Flagship performance; High resolution display; Decent speakers

Dated design; Uncomfortable to hold; Slow-motion feature video is limited