India doesn't have F-15s, but it does have SU-30MKIs which are F-15 class aircraft (according to a USAF briefing, slightly better than a F-15). Probably that was what Freedumb was alluding to: F-15 class. The MKI Flanker is better than the F-16s that Pakistan has, especially considering it has a powerful radar, Israeli/Russian/French avionics, good kinematics, and prodigious combat persistence. There are also upgrades like an upcoming AESA radar that will really give it a shot in the arm. This is before you add in the upcoming PakFa (India is supposed to get around 250 of them), as well as the MMRCA (of which up to 200 Eurofighter Typhoons or Rafales will be selected). Then add upgraded MiG-29s and Mirage 2000s, and the short story is that the Pakistani airforce really has no chance against the IAF.
The main opponent for the IAF, hence the need for certain planes like the PakFa, is actually China. Pakistan and its F-16s/JF-17s could be contained with the upgraded Fulcrums and Mirage 2000s.