Noticing the front landing gear, this aircraft is designed for ski jump take off. I really doubt this aircraft has enough power to take off from Liaoning or other aircraft carrier. Call me nut or whatever but I really have no confidence in this aircraft at all.
The JL-9 is oldtech. It is basically a MiG-21 with a redesigned fuselage. Blech.
No fly by wire and a single old engine AFAIK.
Just as a reference, the Tumansky R-13 engine in a MiG-21 has a thrust to weight ratio of 5.4 (wet) while the Al-222 used in the L-15 has a thrust to weight ratio of 5.68 (dry) or 7.5 (wet).
You are basically comparing a second generation turbojet engine with a fourth generation turbofan engine.
If you wanted to emulate a J-15's hardware which plane would you choose? A single engine aircraft with no fly by wire or a dual engine aircraft with fly by wire? Honestly it is no contest.