I suppose by income I am pretty firmly in the middle class. However, because I am self employed I have managed to reduce the # of hours that I work down to about 1000/yr. As I value my time way more than I value my money I consider myself to be far better off than someone earning $250k/yr who has no time to smell the roses. At the same time, I know some people who would be considered below the poverty line but who live a life of nearly complete freedom. Bob lives in the mountains on Vancouver Island in a cabin that he built for himself. He eats rice and potatoes and fish and walks were he needs to go. His time is almost completely free.
Also, I like to remember the fact that I probably have a better standard of living than most of the kings of history.