Samsung Galaxy Note 4 has the best 4K video recording compared to all other smatphones in the market right now. And I guarantee you you cannot find this quality in any other smartphone including Apple iPhone 6.
Still not convinced by my words, then you should know that according to specification, Samsung Galaxy Note 4 is capable of capturing video at 2160p @ 30fps or 1080p @ 60fps.
Wondering what will be the quality of 4K video. Better check out this exclusive cinematic 4K video entirely captured with a Galaxy Note 4. Change video setting to the highest resolution, while watching the video.