I wonder if everyone sees different colors, but since we learned that's what the color is, we all call it the same.
Color is based from the light hiting objects around you, light will always stay the same nomatter who you are, therfor to see different colors between different people, people must have different eyes. Some people do see different shades of the same color due to age, or damage of the eye, but being the same species and all, i'm convinced that we all see (for the most part) the same colors.