>>11340045they:
have similar lift capacity
were developed for similar purposes (hauling crew capsules into LEO)
have clustered first stage engines
reused technology for the upper stage (Saturn I reused the RL-10 from the Atlas-Centaur, Saturn IB reused the entire SIVB upper stage, Falcon 9 US is very much a derivative of the first stage, with most of the similarities in the tank structure)
but he wouldn't love it just for that: most importantly, he would understand the absolute breakthrough enabling technology that vertical landing is