Are the number of raw pounds a good indicator of lifting abilities? For example wouldn't it be better to use the ratio of self-weight that one can lift?

I consider myself reasonably fit, and I can lift around 75kg (~150-ish lbs). My bodyweight is 54kg(~115 lbs), with shoes on. Even if I eat 2 Schwarzeneggers a day for the rest of my life, I won't be able to lift 120kg.