Bizarre asumption. If Arnold's squatting was so much better, why did they edit out the end of his set, leaving Corney's set as one of the most memorable of the movie.
In his set, I believe he got up to 5 or 6 with 315 on the bar and he stuggled on the last rep. His form wasn't the greatest either, as he didn't even go down to parallel, although granted, his feet were fairly close together, and they have prevented him from going lower saftely.
Still, squatting seems to be one of things you're either built to do or not. You have guys like shawn ray who in his 'final countdown' video only doing 315 tops for reps, and his legs are bigger than Corney's or Arnolds, and you have guys like Platz, who squat 500lb, all the way down for 20 reps.
And it's not a big deal for a college running back to squat 400 - 600lbs., and those guys may be 5'8 - 5'11, 180 - 220lb.
I'd be interested in what Arnolds leg press numbers were like, and I mean the 45 degree press, not the verticle presses that we've seen him doing in pictures.