I'm not so sure about a ranking for live action, but I know them for anime (I'm gonna really try typing carefully this post, excuse any drunken ramblings).
I will try some categories:
INSANE SUPERHUMAN DUEL THAT GOT SHAMELESSLY RIPPED OFF BY DRAGONBALL ZFilm: Fist of the North Star
Fight: Ken vs Rao the Conqueror.
Highlights: Merely the act of summoning their powers near levels a city and destroys an entire army. Skyscrapers are sliced in half with a single punch. By the end of the fight, both fighters are heaving wrecks bleeding EXPLOSIVELY from hundreds of wounds fighting in the middle of a slick of blood. To top it all off, Julia, Ken's true love, is strapped to a cross for the entire duration of the scene
Notes: Fist of the North Star is, barring Violence Jack, the most insanely violent animated feature of all time. The lead characters martial arts ability causes peoples heads to explode when he punches them, and his companion can slice people into neat segments with his bare fingertips.
ONE AGAINST INSANE ODDSSeries: FLCL (Furi Kuri)
Fight: Haruhara Haruko vs Amarao and a legion of secret service goons
Highlights: I don't know where to begin. Haruko begins the fight against a gun-wielding Amarao armed only with a razorblade, and actually SLICE HIS BULLETS IN HALF. Then, when he calls for back up, she CASUALLY SIDESTEPS THROUGH A SOLID WALL OF MACHINE GUN FIRE AND STARTS BLASTING THE SHIT OUT OF SECRET SERVICE AGENTS WITH A GUITAR THAT SHE PUMPS LIKE A SHOTGUN AND FIRES BLASTS OF PURE ENERGY FROM THE HEAD.
I mean, fuck.
MECHA ACTIONJoint prize!
1: Film(s): Death & Rebirth/End of Evangelion.
Fight: Asukas last stand (Asuka + Eva-02 versus EVERYTHING)
Highlights: oh shit, just watch it.
http://www.youtube.com/watch?v=WCDImgHwt4U&search=asuka2: Series: Gunbuster
Fight: Buster Machine 1 versus 3 BILLION 'Space Monsters'.
Highlightd: When the Buster Machine dispatches about 30,000 of the bastards with a SINGLE KICK, the tone of the fight is about set.
SHEER SUPERNATURAL WTFFight: Any fight in any medium involving Alucard
Highlight: He fights a hundred nazi vampires bare-handed, and they all die. HORRIBLY. This is partly to do with the fact that, after they expend all their bullets and grenades trying to kill him, the mutilated remains turns into about 60 extra claw-tipped hands.