Sony's newest, highest-end smartphone yet is here in our hands.

We haven't seen the Xperia Z5 Premium since IFA, and even then we didn't see a whole lot of it. It sits atop the latest range of Sony's flagship Xperia lineup and can boast a world's first to boot.

Say hello to the world's first 4K smartphone.

We'll be spending some more time with the Xperia Z5 Premium over the coming days in the course of a review. But first things first, we've whipped out the old video camera and shot a quick unboxing and first impressions video which you can find below.

If you're not familiar, here's a quick hit list of some of the key hardware specs:

  • Snapdragon 810 CPU
  • 3GB of RAM
  • 5.5" 4K (3840x2160 pixels), IPS display
  • 32GB of internal storage with microSD card expansion
  • 23MP rear camera
  • 5MP front camera
  • 3430 mAh battery with Qualcomm Quick Charge

For a full breakdown of the specs, hit the link below.

Full Xperia Z5 Premium specs

Besides the world's first boast the Premium also completes Sony's Z5 lineup in size. From the Compact at 4.6-inches through the Z5 at 5.2-inches and the Premium at 5.5-inches, Sony has a high-end phone in all the major sizes.

We'll be diving much deeper into the Z5 Premium in the coming days and weeks, but what about early impressions? Well, the black one we have here looks fantastic. The black on black on black is an imposing look, and only the power button breaks it up. Maybe it, too, should have been black? Where perhaps the Z5 Premium loses out on the outside compared to its two smaller siblings is around the back. The frosted, matte finish has gone and the Premium boasts the shiny, fingerprint magnet rear side we've seen on previous high-end Xperias.

Weirdly, it perhaps feels better in the hand at this size than the smaller, 5.2-inch Xperia Z5. It's still a big phone with plenty of top and bottom bezel, but then maybe we're getting so used to large phones it's just becoming less of a thing.

And before closing, what about the display? Well, it might be 4K in hardware but most of the time it's 'just' 1080p. Which means it looks about the same as the 5.2-inch model just with a slightly lower pixel density. In the course of the full review we'll be looking at actual 4K content on this actual 4K display.

For now, be sure to jump into the comments with your own first impressions.