Tejas will be BVR king of Asia, it has very low radar cross section thanks to small size and composites, so it will difficult to detect and track. It has a very powerful Israeli radar and has Indian Computers to share and receive data from Awacs and other radar. It has powerful world-class engines, so it can outrun its adversaries. It has BVR missiles so it can attack adversaries at longer range.
So Tejas will detect and track JF17 earlier, launch BVR missiles, take a U-turn and escape into Indian SAMs range before JF17 can even detect it. JF17 is a perfect target target for Tejas, JF17 higher radar cross section, weaker radar and slower.
Tejas will shoot down lots of JF17s, even a rookie Indian pilot flying Tejas will dominate an ace pakistani pilot in JF17. Tejas will be a game changer.
No one can deny the BVR edge Tejas has over JF17.