The first 4K smartphone is here and it's called the Sony Xperia Z5 Premium. It's been announced alongside the Xperia Z5 and Z5 Compact at IFA 2015 so here's what you need to know about the Xperia Z5 Premium release date, price, specs and new features. See also: Best new phones you should be excited about this year (and in 2016)

We've also got a hands-on review of the Sony Xperia Z5 Premium here.

Sony has skipped Quad HD altogether and trumped its rivals by releasing the first smartphone to boast an Ultra HD resolution. The Xperia Z5 Premium is coming soon and we've got all the details.

"Smartphones are part of people's lives" said Hiroki Totoki, President and CEO at Sony Mobile Communications. "Since users already create, share and enjoy most of their content on the go – we've set out to bring Sony's latest innovations in camera, design and display to ensure the Xperia Z5 series is the best possible lifestyle and entertainment platform."

Sony Xperia Z5 phone range

Sony Xperia Z5 Premium release date and price UK

The Sony Xperia Z5 Premium hit the UK in November, a month later than the regular Xperia Z5 and Z5 Compact, and is now on sale.

If you buy SIM-free from Amazon the Z5 Premium is available for £599. It's also available on contract, of course - for example, Vodafone is offering the Z5 Premium on a £39 pay monthly tariff (with a £99 upfront cost), including unlimited texts, 1000 minutes and 1GB of data. Alternatively, prices start from £49 Pay monthly (with a £49 upfront cost) for customers who want access to Netflix, Sky Sports Mobile TV, Spotify Premium or a NOW TV Entertainment Pass for six months.

Sony Xperia Z5 Premium

Sony Xperia Z5 Premium specs and new features

The big headline feature of the Xperia Z5 Premium is the screen. It's the biggest Z range flagship phone we've seen at 5.5in and is more importantly the first 4K display in a smartphone so Sony wins that title.

You probably don't even have a 4K TV yet but the Xperia Z5 Premium is packing 2160x3840 on its palm-sized screen meaning a pixel density of 806ppi.

The design is similar to the other Z5 phones with IP68 waterproofing but the Premium offers a mirrored finish available in Chrome, Gold and Black.

As for other hardware and features, they are all the same as the regular Xperia Z5 so it's really the 4K display you're going to buy the Premium model for. This means it has a Qualcomm Snapdragon 810 processor, up to 32GB of internal storage, 3GB of RAM and a Micro-SD card slot for adding up to 200GB.

The two key new features of the Z5 range are also found on the Xperia Z5 Premium: a fingerprint scanner found inside the new power button and an upgraded camera - the first new one since the Xperia Z1. It's been bumped to 23Mp and Sony claims it has the fastest autofocus at 0.03 seconds, x5 Clear Image zoom and the best low light performance.

See below for full Sony Xperia Z5 Premium specifications:

•    Android 5.1 Lollipop
•    5.5in 4K Ultra HD IPS display (2160x3840)
•    Qualcomm Snapdragon 810, 64-bit, octa-core
•    3GB RAM
•    Up to 32GB internal storage
•    Micro-SD card slot, up to 200GB
•    23Mp rear camera
•    5Mp front camera
•    3430mAh battery
•    Nano-SIM
•    IP65/68 waterproof
•    Chrome, Black, Gold
•    76x154x8.9mm
•    180g