The M4k is equivalent with F-15A in speed and load
That's actually where the problem is since the US and McD-D were able to aggressively market (and apply diplomatic pressure) in favor of the F-15 in the name of freedom and 'murica. The best chance of the M4k getting sales was to market a multi-role ability - if people were even interested back then (attitudes about tac-air have shifted greatly since).
Nice Mirage 4000. I've always though this was one Dassaut that should have been produced, but then Dassault never had any real success with larger twin-engine fighters.
Well the M4k ultimately became a very, very early prototype for the Rafale which is seeing some sales success at least, so....