It's configured to run at the native resolution of the device, and looks good, but I'm not sure it is really at 4k.
Skyrim performs flawlessly, but Baldur's Gate gets sbout 15 fps at this rez, so I have to lower the graphics setting. I'm nesr endgame, so there is a lot of city animation.
I'll pick them up in the tax-free section of the airport! :)