Sony has unveiled its own foray into 5G tech at the Mobile World Congress (2019). It is a phone that, with its 21:9 aspect ratio, resembles the new Xperia 1 closely. The OEM did not offer much detail on this device, besides that it is powered by the Snapdragon 855 and runs the X50 modem.
https://www.notebookcheck.net/Sony-shows-its-5G-phone-prototype-off-at-MWC.410837.0.html