My friend has mi 4 who recommend me that but the same day this model launch . I found no difference only of ram and resolution but same processer at low cost of 3000.
This phone has very good processer of snapdragon.You can play very large games very easily without hang problem .Very good camera quality of both rear and front one. Display is of 5 inch which is little cool.Good performance in ram section.variation in colour also provide option for your best choice.only weak point is heat problem during charging and if you use for long time.
Overall this phone is best phone in its price range. If you are looking to buy a phone in this price range you should go with mi 4A