Good friend and former training partner was the best squatter I have personally seen. One day I watched him do a routine of 515 for twenty reps, 535 for twenty reps, 585 for five reps and then a final set of 515 for twenty reps. He did these weights with ease and they were done after leg extensions and leg curls. He was about 6' 1" and 250 pounds. I asked a powerlifter what he thought the guy could do for one rep and he said at least 700 or more. This was in the mid 1980s, no stupid suits but he did wrap his knees and wore a four inch belt.
We moved to a new gym one summer that didn't have enough weight to go around and so he would do things like a single set of 225 for 100 reps. Another day I watched him do 300 for 50 reps. This was a guy that did 700 pounds for 50 reps on the inverted leg press and broke our leg extension machine while repping with 750 pounds. Couldn't bench press to save his life but I did see him easily deadlift 500 one day when the power lifters were joking around with him.
Me? Even though I'm tiny I can't really do squat on the squat. Go figure. My buddy said it literally changed his physique and I believe him.