went to indian forum, there is a guy doing comparsion on stealth characteristics of j20.  now i'm not a stealth expert so, if anyone want to verify/aruge true or not. go for it.  post #1488 & #1491
		 
First set of pictures: F-22 doesn't have these sawtooth on the control surfaces either.  Sawtooth isn't needed when proper edge alignment has already been used on the J-20.  That's not to say it isn't an interesting solution.  Also, read the statement on the F-22's picture, and you will see that he still thinks the trailing edge of the J-20 is "flat".  Obviously, he is ignorant to the top-view of J-20.
Second set of pictures: the structure used to hide the gap on the J-20 is right in the picture.  It is more elegant compared to Rafale's (and J-10's) solution because it is not an after-thought.
Third set of pictures: how does he see RAM coating and the material being used with naked eyes?  What an idiot. 
 
Forth set of pictures: he just highlighted the break in continuity in the left picture.  In that same picture, we also see the top-view of F-22 showing the exact same break.
Next five pictures: I have seen this argument before.  The problem with this argument is that round edge also exists on F-22, F-35 and PAKFA as the chine of the nose.
Next four pictures: 
 is a top-view diagram for all three stealth aircraft.  One less edge represents one less direction to reflect radar to.