Redmi Note 4 , the immediate successor of Redmi note 3 , the massive popular pick from Mi or their comeback to the industry in 2016, is not that expected upgrade but surely not imposing as its priced in the same bracket.
Here I am not including a detailed review but a small list of points where RN4 made a difference over RN3.
Built Quality was notably good in RN3 and there is not much in improving in this price range., any how with2.5T glass with curved edge surely bring a good difference in top view and on grips. On the back the black matte finish again came with good grip and over all the device seems to be lighter from RN3
Camera & Display
Both RN3 and 4 have 5.5-inch full HD Display that supports a resolution of 1920 x 1080 pixels with pixel density of 403 ppi., and both Carry camera 13 mp rear and 5 MP front where RN4 got more improvement in camera performance. Both these cameras carry features like PDAF and dual-LED flash.
Storage and RAM
RN3 comes with 16GB and 32 GB Variants where RAM varies from 2 to 3GB resevtively, in RN4 there is one more variant with 64GB of storage with 4 GB of RAM over these 2 models.
Both are running on MIUI 8.0
RN3 comes with a 4050 MAH battery while RN4 carry slighly bigger 4100 MAH Battery to offer more battery life
Both having processor make Qualcomm Snapdragon RN4 having 2GHz octa-core 625 and RN3 having 1.4GHz hexa-core Qualcomm Snapdragon 650