I have samsung galaxy s6, the device comes with lollipop ie. 5.1.1 and fast charger which charge the phone very very fast. The Ram is about 3GB and inrernal storage of the device is 32GB.
Basically the galaxy s6 doesn’t lag and smoothly working. The looks of the device is also very good. The camera is 16 megapixels and front is 5 megapixels and camera clearity is very fine. It records 4K resolution video.
Totally I recommend to evey one to have this smart phone