Sony has been a bit shy about stepping up from 1080p displays for its handsets to quadHD, but it appears the next smartphone in its Xperia Z series will feature a 4K display.

That 4K face would be a first for smartphones.

What looks like an iteration of the upcoming Xperia Z5 has appeared in a user agent profile. The handset is listed as a device from Sony's E68XX series, the home of the company's Xperia line.

The handset, possibly the rumored Z5+, is described as a device from Sony Mobile that has a resolution of 3840 by 2160 pixels (4K). Whatever it is exactly, it will also sport a top-of-the-line Qualcomm Snapdragon 810 processor.

No other specs were revealed in the leaked user agent profile, but it's safe to assume the Z5+ will have a camera at least as good as the Z4's 20.7 MP shooter.

Although not listed on the agent profile, the Xperia Z5+ is expected to be a Z5 family's big phablet. The 6-inch Z5+ would be accompanied by the 5.5-inch Z5 and the even smaller Z5 Compact, if reports about all three of the unannounced phones are true.

The Z5 and Z5 Compact are also expected to fingerprint scanners and plain old USB ports, instead of employing the new USB Type-C. If the Z5+ is a real thing, it follows that the handset would include a fingerprint scanner. A USB Type-C port would also make sense in what would be Sony's most advanced smartphone.

Sony is attending IFA 2015 next month in Berlin and is expected to introduce the Z5 and Z5 Compact during the consumer electronics trade show.

While the Sony's 4K smartphone hasn't been confirmed yet, Sony Mobile announced last month that it's expanding beyond phones and tablets. Sony's mobile division has joined forces with ZMP to launch Aerosense, a firm that will focus on drone facilitated image capture and cloud-based data processing.

For a unit some believed could be sold or shuttered, Sony Mobile is certainly appears to be pouring considerable effort into innovation.