The Lenovo K4 Note comes with the 5.5-inch 1080p display. the K4 Note is powered by a MediaTek MT6753 octa-core processor.
The device come with a 16GB of internal storage and the K4 Note has a 3GB of RAM.
The K5 Note is limited to just 2GB of RAM. Coming to the camera department, there is a 13MP rear camera with PDAF and dual LED flash on both the device and on the front, the K4 Note has a 5MP sensor while the K5 Note comes with an 8MP sensor.
The devices support dual SIM dual standby and offer 4G LTE connectivity. The device comes with a fingerprint sensor placed on the rear side. In case, if you are thinking of expanding the storage, the device supports up to a maximum of 128GB. Even though the devices come with a same 5.5-inch display, the K5 Note measures slightly smaller in length and breadth. The K4 Note is backed by a 3, 300mAh battery and on the other hand, the K5 Note features a slightly larger 3, 500mAh battery capacity but measures less thick than its predecessor.
Overall its good phone. Go for it.