I have used asus zenfone2 and really trust me it is best phone in the budget of 12k.other companies will give you these range of features in almost 20k. This phone is very well designed looks very slim from front but actually fat from back. It is very easy to operate you can operate it with one hand also. It has 5.5 inch display with gorilla glass. If your phone slips from your hand your screen will not break easily because of gorilla glass.it has 3 gb ram and very fast processor.
Sisadvantages of this phone are camera quality and battery backup.this phone has camera quality up to the limit but when zoom in takes place pixels gets burst and battery backup is also not good although it has 3000mah non removable battery. It has variety of features like NFC’s tag, you can use your phone as a mouse with the help of mouse pointer, screen get unlocked and locked by double tapping the screen, sound quality is also awesome.if anybody has budget of 12k go for this phone.it is masterpiece and total value for money.