Not 100% — in a libertarian society there would still be much income inequality.
Income inequality is one of the great drivers of human progress and is highly desirable in any society.
Income equality stifles ambition and innovation. If there is no reward for risk taking there will be little progress.
Of course, complete income equality is a utopian fantasy. Everyone is endowed with different interests, skills and ability.
Communist/statist societies are, ironically, the most unequal of all. Ive seen it first-hand. Its income inequality is hidden, and is expressed as power and control over collective resources.