I think I agree with that. Da Vinci overall, in almost every field of endeavor. And his personal accumulated notebooks that are free online are simply astounding.
Bohr, very very good. Probably yes, higher than Newton.
And I think Feynman is right up there with Bohr. If nothing else his stand on string hypothesis (I cannot call it a theory) gets him up there.
My friend thought Feynman was very clever, but not working on the most important work to be done. But of course Feynman was from the US and not from Europe, so take that into account.
Leonardo’s knowledge of anatomy, physiology, and mechanical engineering was stunning because his knowledge was far more accurate than his contemporaries. If he were alive today, he would be correctly describing science and engineering principles for the 26th century. Not many people know he designed the first practical contact lens. Something that didn’t really catch on until the middle of the 20th century. The fact that he understood the importance of the front surface of the eye for refraction was well ahead of his time. This was something that would not be understood until the 1850s.