1. iPhone 6s Plus
The hottest iteration in the iPhone series has a much-needed improvement to offer in terms of primary camera resolution. The old 8MP sensor was updated to a 12MP sensor with 1.22-micron pixels, while the lens is now 5-element piece with an aperture of f/2.2. The iPhone 6s series can shoot 30fpsvideos at a resolution of 4K (3840 x 2160 pixels). On top of that, it also supports 1080p video capture at 120fps, or 720p capture at 240fps, frame rates that allow for some radical slow-motion effects.
2. Sony Xperia Z5 Premium
The new Sony Xperia Z5 family, comes with 4K recording abilities, which is hardly surprising given that the feat was available on last year's Xperia Z3 family as well. The flagship smartphone Sony Xperia Z5 Premium comes with new 23MP 1/2.3" Exmor RS sensors. Furthermore, it also comes with hardware OIS system that Sony markets as the SteadyShot Intelligent Active Mode, as well as blazing-fast hybrid autofocus system. The Xperia Z5 Premium is the only smartphone out there that lets you view 4K videos at their native resolution.
3. Samsung Galaxy S6
The Samsung Galaxy S6, the Galaxy S6 edge, the Galaxy S6 edge+, and the Galaxy Note5 all come with 16MP primary sensors with phase detection autofocus and optical image stabilization. 4K video capture is done with clear audio recordings, continuous autofocus, great color reproduction and all of the details that fit inside a 3840 x 2160 pixel matrix.
4. LG G4
The LG G4 features a 16MP 1/2.6" primary sensor with laser autofocus and optical image stabilization. LG G4’s 4K video capture yields produces good results overall, with lots of detail, no brutal shakes, and low digital noise in low light conditions.
5. Huawei Nexus 6P
Huawei Nexus 6P come with 12.3MP Sony sensors with an aperture of f/2.0 and large 1.55-micron pixels. The sensors are actually capable of shooting 4K video at 60fps per second, but current-generation smartphone chips, including the Snapdragon 808 and the Snapdragon 810 - are limited at 60fps.