Common myth.
For example: Take 2 identical cars, both weighing 3000#. In the first car we are going to put a Formula 1 engine, makes about 800HP and about 380ish ft/lbs of torque.
In the second car we will put Diesel engine, 300Hp and like 500 ft/lbs of torque. The car with the formula 1 engine will win races all day long over the diesel powered car. I agree that there are plenty diesel powered cars out there that perform pretty well. But they are not superior to gas burners. All these 4 strokes you ride with, have more torque then your banshee. Do they usually beat you?