S30V and D2 both outdo VG-10 on terms of general toughness, but VG-10 is actually more corrosion resistant than S30V, and not as brittle as D2. (While D2 is very strong, it's also very brittle, and so is best suited to smaller knives made for slicing.)
I don't know if they're *that* superior; rather they just excel at different things. The three of them are all excellent steels.