The Shenyang J-31 is a 5th Generation MRF which is envisioned to be Communist China's answer to Uncle Sam's F-35 Lightning II. Just like the latter, it is a stealth aircraft that will be made available to the international market.
US warfighting whiz kids believe that the J-31 will be able to match-up against any 4th Generation MRF (e.g. F-15, F-16, F-18, Gripen, Rafale, Typhoon, etc.).
If deployed in Communist China's fake islands in the Spratlys, the entire Philippines will be practically within its range, without any aerial refuelling. And its stealth capabilities will enable it to elude most air defense radars.
It is expected to be deployed in 2019. That's only three (3) years from now.
The PAF will have to take into serious consideration the Shenyang J-31 in determining its choice of MRF.
Who would want to spend a small fortune on an MRF that will only be able to barely hold its own three (3) years from now?