Specs aside, what does it actually look like? It is eye-catchingly perfect, but it’s not immediately obvious that this is a 4K display. It’s only up close that you get an idea of just how sharp this screen is. You can put it as close as you like to your eyeballs and you will not be able to detect a hint of pixelation. Look at it side by side with a 1080p display, however, and the difference is stark: the colors are lush, the detail is impressive, and you get a greater sense of depth.
The camera is a little harder to test on the show floor, but it’s certainly fast, responsive, and seems to take high quality photos. Although the large sensor is rated at 23-megapixels it scales down to 8-megapixels. This means you can zoom in on photos without losing all the detail.
There were issues with overheating in the early versions of the 810, and it’s something Sony has struggled with in previous Xperia Z phones, especially when it comes to 4K recording. I found the Z5 Premium wasn’t running especially hot when I used it. Recording video definitely turned up the temperature, but it never reached uncomfortable levels.
Sony has put a hefty 3,430mAh battery in the Z5 Premium. When I dipped into the power management page and took a look at battery usage, I could see that the demo model had been running all day yesterday and for a couple of hours this morning without being charged and it had 21 percent left in the tank. Perhaps a couple of days between charges, even with the 4K display, isn’t an impossible dream.
Unless you have the phones side by side and on certain content i.e. this forum when zoomed out then you are going to have an extremely hard time noticing the difference. Even MKBHD was hard pressed to notice the difference between the OP2 1080P screen and 2560x1440 screens and he is a massive "pixel peeper", in fact I think he originally thought the OP2 was a qHD display...