Answer:
Most farmers in the world have benefited to some extend from the Green Revolution, because the Green Revolution has increased agricultural productivity and output dramatically, and a farmer's income, either from rent or from wages, depends largely on this factor.
Explanation
However, there are other factors at play that determine a farmer's income. For example, many farmers around the world do not own any land, and they have to pay rent to a landlord, or have to work other people's land as sharecroppers. In these circumstances, farmers are not likely to enjoy all the economic benefits from the Green Revolution that they could if they owned the land they work instead.
Their income also varies from country to country, depending on specific economic policies, and for this reason it is difficult to make a sound generalization, although one can certainly assume that most of them have benefited in some way, at least in cheaper food prices, and more abundant food sources and quantities, these latter two representing an increase in the real income of farmers, even if their nominal wages have stagnated or even fallen.
