Although my current cameras can record HD 1080 video, if I’m specifically working with video on a project I want to be able to shoot footage at 4K. There are a wide range of cameras that can shoot 4K from a GoPro at a few hundred dollars to cinema cameras at a few hundred thousand. After looking at the options, and discussing things with my friend Jon Galione, I bought a Sony A7S II that will allow me to start shooting 4K internally and produce high quality footage.
Just in the testing phase at the moment, but here’s a few seconds shot with the A7S II and a Rokinon 85mm lens.
Okay Go!
TRAVEL 67 : Chris Willson Photography 
Chris, So what is the advantage of 4K over 1080 video? Regards Chris
The biggest advantage is that you can crop your 4k clips quite a bit before you see any degradation on your 1080 videos. This allows you to do pans, zooms and image stabilization in post with no loss.
4K televisions with around 4 times the number of pixels compared to 1080 will become the norm. As a content provider I want to be able to shoot in 4K so I can provide clients with the footage they need for their projects. Advantages are high levels of detail, disadvantages are the amount of data you have to deal with.