4K resolution
So while 4K UHD sounds like it has a pixel structures with 1/4 the area of 1080p, that does not happen with pixel shifting. Only a true 4K projector offers that level of resolution. That's why "true" 4K projectors cost so much more than 4K UHD projectors with otherwise similar feature sets. They produce smaller pixels, finer resolution, no compromising of detail or color from overlapping pixels. By comparison, the slight difference in aspect ratio between DCI and 3840×2160 pixel displays without overlap is insignificant relative to the amount of detail.
Phantom (UAV)
The 4K was released in early 2016. Although both the controller and the aircraft appear to look similar to the Phantom 3 Advanced/Professional, the system is very much like the Phantom 3 Standard in that it uses 5.8 ghz for control and uses a 2.4 ghz wifi signal for FPV and telemetery. The range is slightly improved. The controller lacks hdmi / usb ports. The aircraft includes the Visual Positioning System module seen on the Professional/Advanced models.