What Wilks does is to look at your lift total, and multiply it by a number generated from a formula based on your bodyweight. The formula is given
here. This formula then gives a score. It's based on actual performances out there.
The Wilks score is not based on the
difference between your lift and your weight; is
proportional to it, but not linearly proportional. The guy 50% heavier can't necessarily lift 50% more. That is, it is actually more impressive that a 100kg person lifted 200kg, than a 50kg person lifted 100kg.
For example, if you look at
world bench press records, you see that men have managed to lift up to 3.51 times their bodyweight when under 114lbs, but only 2.28 times bodyweight when over 308lbs. Similar results are found for
other lifts.
Big guys lift big, but...
Oh, and trofius will not be #1... The full Wilks score is based on more than just bench press. Once you factor in squats and deadlifts and so on, a large number of lifters will outscore him.