Yes they are (sadly)!! Stolen designs and tech from the JSF. They have 2 prototypes ready and 2 being created for testing. You can see resemblance with the American platforms. The thing went up from final 15 in about 10 seconds, which I think is pretty good for a copy.......but their engine still blows smoke like an old car with a blown gasket
1) FC-1 in Pakistan won't replace the F-16's. The F-16's are there to stay beyond 2030.
2) The JFT block IV will be a potential addition which might form the top tier of the PAF, putting -16's as a complimentary second tier due to home built and advanced enough, eventually replacing the - 16's!! Plus if the PAF acquired any twin engined jets, those will also supplement too.
3) FC-1 will form Pakistan's top stealth tier (5th Gen) and would also serve as the master design for the JFT block IV and V (smaller, one engine stealth optimized planes).
4) China will induct the FC-1 in large numbers, specially in their Naval air fleet, and on AC's.