J-20 No.2015 is very close to final condition,
J-20 doesnt use Russian 99M2 as most foreign 'experts' and Russia media claimed
it uses improved third gen turbofan, domestic engine.
phase A wont have WS-15 but domestic improved third gen turbofan, Max 14.3 metric tons thrusts
phase B will be fit with WS-15
J-20 deployment version will have soft laser weapon, not to shoot down a plane or kill a ground target, but to 'kill' infrared guided missiles
Comparable some engine specifications between US/Russia/China :
Here is the different 3D thrust vectoring nozzles between the US/Russia/China.
The J-20 "soft kill" laser system will most likely be something like this:
These system tend to inhabit civilian airliners and VIP aircraft such as AF1, but they are also making an appearance on military aircraft, transports being the most common, but they are appearing on combat systems too.
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Making missiles toast for 50 years
Northrop Grumman is proud to have been at the forefront of warfighter protection since 1961. That's when our engineers developed the first active onboard IRCM system capable of defeating an air-to-air, heat-seeking missile. Today, our DIRCM laser-based systems protect over 750 aircraft, including large and small fixed-wing, rotary-wing, and tilt-wing platforms.
The AN/AAQ-24(V) Directional Infrared Countermeasure (DIRCM) system is the only DIRCM system in production today that will protect aircraft from today's infrared guided missiles.
Traditional IR countermeasures are not effective against the modern IR missiles that are growing in popularity among terrorist groups and in thirdworld countries. A Directional Infrared Countermeasures (DIRCM) system is required to defeat the latest and future advanced IR threats, and has a lower life cycle cost compared to other IR countermeasure approaches.
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Other Northrop Grumman IRCM Systems
CIRCM: Common Infrared Countermeasure Systems
Designed specifically to protect rotary wing and medium fixed wing aircraft from IR missiles, our CIRCM offering uses a compact ECLIPSE pointer/tracker, a lightweight COTS processor and advanced Quantum Cascade Laser (QCL) technology for greater reliability and scalability. Learn more about Northrop Grumman CIRCM.
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Common Infrared Countermeasures program - Wikipedia, the free encyclopedia
Military fighters generate nowhere near the necessary power, at least not without complicated and heavy machinery, to field an effective anti-drone laser. These types of "laser systems" are most commonly IR countermeasures not offensive weapons... even though that has been talked about too.
Considering the OP itself states, "J-20 deployment version will have soft laser weapon, not to shoot down a plane or kill a ground target, but to 'kill' infrared guided missiles" this is a safe guess.