Why do heavier objects fall faster?

It may be noted that all objects fall at the same rate. All objects accelerate at same rate on the earth at 9.8 per second squared, whether it is light or heavy. But, this happens only when there is vacuum. Robert Boyle, a scientist, placed a coin and feather in a glass jar. He removed all the air from it. Then, he inverted the jar and observe that both the feather and coin fell to the bottom at same time. In earth, the speed of the fall of the object depends upon the surface area and air resistance. The feather has more surface area as compared to the coin. Hence, more air pushes above the feather than the coin and offering resistance. And hence, feather fall slowly than the coin.