Indeed. There is an interesting discussion on Quora about whether he was smarter than Einstein.
https://www.quora.com/What-was-John-von-Neumanns-IQ-Was-he-s...
The conclusion seems to be that he had a higher raw IQ but Einstein was a 'deeper' thinker and better aesthetician. General relativity (which took Einstein 10 years of 'thought experiments') is often considered the greatest achievement of any single human mind. In Einstein's words:
"After a certain high level of technical skill is achieved, science and art tend to coalesce in aesthetics, plasticity, and form. The greatest scientists are artists as well." - Albert Einstein, 1923