Get Panasonic GH4 at B&H Photo.
Added to the Poppies videos is a very low light example of California Buckeye flower spikes in a gentle breeze.
My interest here was 1080p video quality derived from 4K in a a very low light situation, the idea being that downsampling to 1080p from 4K should be of benefit just as it is for still photos.
Includes links to an online-playable 1080p video derived from 4K UltraHD as well as the downloadable 4K UltraHD video original.
Also included are still frames at 1920, 2560 and 3840 resolutions.