Alright, so after many questions about Ken's Sweep combos in Ver.2012, i took some hours to find out on how many characters this is possible. This combo is not only Character specific but also Distance and situation specific. You cannot rely on this combo in real matches though.
Here is the list of character's on which the combo is possible: (If you guys find any other character than the below mentioned, then do let me know) Thanks.
Ryu
Vega
Yang
Balrog
Rose
Mokoto
Dudley
E.Honda
Sakura
Ibuki
C.Viper
Bison
Cody
El fuerte
E.Ryu
Fielong
T.Hawk
Adon