Eddy Merkx was just amazing. it was not only that he raced year round, but won too. Also, when he won stages in the Tour de france, it was not by taking the lead in the last 2 km, but he would attack with over 80 km left and win. Kinda like hamilton's stage win in this years tour.
It is really hard to compare cyclists from different eras because equipment, training, and competition is so much different now then in the early 80's.