Depends on the model of A-4.
The A-4M had a big engine, and performed way better than those with the smaller engines - unsurprisingly!
I believe the Super Fox also had the big motor, but was lighter than the M 'cos it didn't have some of the kit on board.
A-4 against Meteor? I would back the A-4M.
Against the Hunter? Probably still the A-4M, especially if clean wing.
For a true answer, you need to get the NATOPS manuals and compare!!