I will instead sell off my S4 n keep the Note2

If Note 2 can upgrade to latest android, better keep note 2 coz it has pen & feel like tablet too(2 in 1).

If Samsung release Note 3 add with 3/4GB ram, bigger memory & bigger full HD screen, many tablet will die.

apparently they going the route of lesser is better in the sense that similar phone (or smaller) but larger screen

It is purely my personal preference
I always prefer a bigger size display phone as my main phone. I have bought and tested xperia Z ( 5 inch), HTC One ( 4.7 inch) and now the S4 ( 5 inch). None of these 3 can ever matcgh the satisfaction of using a 5.5 inch. I have even bought the Pantech Vega No6 wich comes with a full HD 5.9 inch display ( should be receiving it tomorrow)

The only obvious advantage of the S4 over the Note 2 is is its amazing full HD display - Samsung's finest to date. Even though is still pentile based it does not in any way loses out to HTC One
As I am not a gamer, the better and more powerful processor is insignificant to me

One major disappointment of the S4 is its obviously poorer audio quality through its phone speakers vs Note2. The other minor issues ( to me )  is still the unrefined TW additional software stuffs ( I have posted before my comments on these) and the available only 8.8 gb internal storage ( vs 11 gb of Note 2, S3) to user