J-31 (speculated Azm) radar is also KLJ-7A, high end variant matches its nose shape.So just to get the facts right
lkf 601E is the aesa tht replaces the mechanical KLJ 7 v1/2 radar in block 1 and 2 respectively...
And
Klj7A aesa is for block 3...
Now where would you put the so called high end radar???
Mechanical steared array is enough, same mechanical + electronic staring used in Grippen NG for high angle of coverage.