Yes, great comparison. Although Lee was much more successful as a battlefield general--GW's defeats far outnumber his victories. Of course, part of his brilliance was realizing that he didn't have to win battles.
What both Lee and Washington had, though, which is the reason for their legends, is great strength of character, a calm humility, and a sense of honor and duty both toward their men and their countries, that their men would have followed them anywhere. Both were model servant-leaders (particularly Lee, who after the war took a job as President of the bankrupt Washington College because he felt that educating the next generation might help him to heal the wounds of war).