S30V is extremely dense. If you get a good (REAL good) edge on it you'll have a great tool, but it takes some patience and dedication to resharpen.
440C is good solid steel. But 154CM (which is molecularly identical to ATS34) is better. It'll vary based on the heat treat. 440C could be heat treated to a more ideal hardness/toughness than an ATS34/154CM, just depends on who did the cooking and what they were shooting for. (EXTREMELY HUGE FACTOR IN ANY KNIFE NO MATTER THE STEEL.) The heat treat being equal, 154CM/ATS34 is superior to 440C.
(Side note, the 420's, and the other 440's are inferior to 440C. But 440C is real good.)
Typically, a few carbons perform better when it comes the the hardness/toughness balance. D2, O1, A2, and a few others are top drawer. They patina, sure, but they're the best when it comes to a working knife. Stainless doesn't reach the same ideal. Good alloys (as above) can get really close, and stay shiny, but not quite as good. Carbon tool steel is hard to beat.