Been trying out the new Phantom 3 Professional, which is capable of 4K video. Overall I am very impressed with this little machine. It will definitely be a welcome addition to the gear bag, and I predict it will get quite a bit of use.
Here is a quick 4K video sample
Here is another video sample straight from the DJI Pilot App, no enhancements to the file, in fact it was actually reduced down to 720p to keep the file small.