Blade Runner was the ultimate source, but it's the raw beginning, not The Cyberpunk Movie. Blade Runner to cyberpunk is like LOTR to fantasy, it's the starting point, all the elements can be found, but not the typical movie of the genre.
For me Ghost In The Shell (the first animated movie) is the biggest cyberpunk movie ever made, Alien2 is definitely counts as cyberpunk in terms of world-building.
My problem with Johnny Mnemonic is that I missed the flashy 'cyber' part , it felt more like an action movie.