Art Pepper is awesome.
I would add that those whose music challenges me the most - to the point of sometimes not LIKING it - are those to whom genius I can apply. Also those who are very subtle but whose class and beauty and complexity I grasp at only later fall into this category.
So: Dixon, Braxton, Cecil (tho his music was always "easy" for me to like), Ayler, Trane, Joe Maneri, Roscoe, Monk, Nichols, George Russell...