A drug-free person working out side-by-side with a user will never keep up. The user will excede them by leaps and bounds. The drug-free person can still get bulk up and get strong but it will look more natural and take much longer to achieve. Also, when the user stops taking they will backslide very quickly.

Diet also makes a huge difference. Drug-free lifters that eat right can achieve the young holyfield look. No problem.

If you see a guy in the gym squatting 1200 pounds he's a user...