4K resolution is a generic term for display devices or content having horizontal resolution on the order of 4,000 pixels. Several 4K resolutions exist in the fields of digital television and digital cinematography. In the movie projection industry, Digital Cinema Initiatives (DCI) is the dominant 4K standard. Read more about 4K on wikipedia
So far we have 3 Android devices which are capable of recording 4K videos, and those are
- LG G Pro 2
- Samsung Galaxy Note 3
- Acer Liquid S2
- LG G Flex (Suggested by Neil Lund)
So far I know about above 4, help me add more to include all related smartphones in the list. Thanks.