I received my Lenovo Vibe K4 Note 2 days ago and here is my review on it.
This phone is released in January 2016, and its specs are amazing. The design is simple, but elegant, it has a mature style.
It has a 5.5 inch display but only weights 158 grams. The Full HD display(1080x1920) with 16 m colors, is just perfectly balanced.
The latest Android 5.1 Lollipop is run by an octa-core 1.3 GHz Cortex-A53 processor and it is a real pleasure to use the phone(it doesn’t lag, it’s just really fast). The phone has an internal memory of 16 GB which can be extended with a SD card(up to 128GB) and it has an enormous 3GB of RAM. You can easily take amazing photos with a 13 MP back camera which has a superb auto-focus system and dual-LED(dual tone) flash, which also films 1080p at 30 frames per second(FullHD) or you can use the front 5MP Camera - unfortunately front flash is not included.
Connection: WiFi(Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, hotspot); Bluetooth(v4.0, A2DP, LE), GPS, NFC, Radio, USB(microUSB v2.0). The phone has a non-removable Li-Po 3300 mAh battery, which will last a full day of heavy use. One of the top features is the fingerprint reader on the back which I have to admit that works surprisingly well.
Price: Lenovo Vibe K4 Note is available on amazon at a price of 11.990 rupees.All in all, considering the price range and the features of the phone, after a 2 days use I can say that there is only one negative aspect about it: it only comes in black.