According to the Phone Arena, the difference actually lies in the resolution. UHD has a resolution of 3840 x 2160 pixels while 4K has a higher resolution of 4096 x 2160 pixels.
Smartphone cameras of 2014, as well as those which made it to the market this year, can shoot videos at 3840 x 2160 pixels, which means that they are merely UHD capable. Only the OnePlus One smartphone can shoot videos at 4096 x 2160 pixels, and is thus the only smartphone to date that is 4K capable. Of course, that could very well change with the advent of the OnePlus Two later this month.
The OnePlus One had its fair share of glory during its one-year market cycle and it’s about time that it relinquish its good run to its successor, the OnePlus Two.
If the OnePlus One packs a punch, then its successor is expected to pack a wallop. The OnePlus blog notes that apart from an upgraded Qualcomm Snapdragon 810 processor, the OnePlus Two will feature a 4GB of LPDDR4 RAM, ensuring that it is extremely powerful and future-proofed.
Despite the upcoming new flagship smartphone OnePlus, is not about to simply let its current flagship smartphone, the OnePlus One, go quietly into the night and let its successor take the limelight all by itself.