I believe on faith that most of the traders included in Jack Schwager's Market Wizards series would have sub-par Sharpe ratios. There is a reason for this. Outstanding traders typically have right hand outliers on their performance bell curve. Right tailed performance is greatly penalized by Sharpe. Maybe for run-of-the-mill CTAs and money managers Sharpe might have some use, but Sharpe has little value when looking for all-stars such as Stan Druckenmiller, Paul Tudor Jones, Bruce Kovner and the like