at par with SU-27skm,rather than SU-30mkk.
means that China stll have a lot technical glinch to overcome.
No. Su-27SKM is equal to slightly better than the Su-30MKK. They have after all, practically the same systems. One can say that the Su-30MKK/MK2 is the twin seater equivalent to the Su-27SKM, or the Su-27SKM is the single seater equivalent to the Su-30MKK/MK2. To put it simply, the only significant different between the two are the number of seats.
Also Pinkov is typically blowing hot hair. If the Russians believed that the J-11B is only equal to the Su-27SKM, they are delusional.
Lets start with the radar design. The Su-27SKM and Su-30MKK still uses the Twist Cassegrain antenna. Do you know what that is? A Cassegrain is something you see with a telescope. There is one reflector on the back and a small reflector on the front. The whole construction is like a tube. To scan around, the whole assembly "twists" as the reflectors contain polarizing elements that will direct the beam to one direction.
On the other hand, a slotted planar array consists of a flat dish that is supported and moved by a mechanical, robotic arm. The dish contains slots that acts as radar wave guides. Other than the radome and IFF antennas sticking out, the whole thing is remarkably simple.
Now why is a slotted planar array superior to a twist cassegrain design? The explanation is simply right there staring in your face. The Twist Cassegrain needs a structure to hold the second reflector in front of the main reflector. In photos of the N001 radar itself, its looks like tube.
All that stuff blocks away optimal radar reception. If you want the best radar reception, you need as little stuff in front of your main dish as much as possible. You don't want anything to block it.
Now imagine the kind of mechanisms that need to turn the cassegrain around to scan around its field of view. You have an idea that it will be much more complex than the arm on the planar array. So it may not scan as fast.
You may also think that the arm on the planar array gives superior flexibility, and with it superior field of view. And this is true, in fact, nothing in this world, not PESA or AESA, has yet to match the field of view of a planar array.
Since the planar array does not use polarizing elements to shift its beam to the side, it has very little sidelobs. All it does is physically direct the main beam to the side. As a matter of fact, the good old planar array probably have lower sidelobs than a PESA. When you have lower sidelobs, more energy and emission is put on the main beam, which means more range, and more signal gain. At the same time, with less wasted energy going to the sides, the radar is less likely to be detected by other receivers.
Given that the arm in the slotted array sounds less complex than what it takes to scan with a twist cassegrain, it may overall be more reliable in the long run.
The fact that the J-11B (and the J-10, the J-8F, and the JH-7A) uses a planar array is already a step ahead of the Su-30MKK or Su-27SKM.
No surprise why China would not want the Su-27SKM.
China in fact, was working with Russia to the development of the Su-30MK3, which was supposed to have a slotted planar array called Zhuk MSE. China previously wanted Zhuks even at the time they were acquiring the J-11 under license; the Zhuk equipped Su-27SK is called the SMK.
All that didn't happen, but its a good bet that the J-11B is roughly the equivalent to the Su-30MK3 instead. The Su-30MK3 project was stopped, and you may guess the J-11B may have something to do with it.
In addition there are other neat things the J-11B seems to have over the Su-27SKM. The wide screen wide angle HUD for example. The optical/UV based MAWS is another. Only the Su-30MKM has this level of missile warning protection. The lighter weight, with correspondingly more powerful engines, and a better RCS reduction.