Since i updated , i noticed this differences
1.The user interface is extremely smooth
2.The contact app is different a little bit
3.The themes has the option to modify the colours in a specific theme now
4. the stereo speakers still uses 1 speaker during calls and when one speaker phone
5.multitasking is more responsive and phone is extremely faster and just too smooth
6 .The camera is faster and auto focus not jumping everywhere as it did
7.The phone is not as hot as it was when using the camera
conclusion worthy update to have for this superb device 
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