Well let's try and find a good way to compare the two with power levels.
We know that Roshi was able to destroy a moon with a power level of 139 (Raditz's scanner). However we all know that when Piccolo fully charged up his attack on Raditz his power level increased from 408 to 1330. That is a multiplier of 3.26, and if we assume that any character's power level increases by a similar amount when they charge up then we can assume that Master Roshi's fully charged kamehameha actually had a power level of 453. So the power level needed to completely destroy a moon is approximately 453.
Now we know that the Earth is 80 times larger than the moon so in order to figure out the power level needed to destroy the Earth we multiply 453 by 80, this means that the power level needed to destroy a planet the size of Earth is 36,240.
Now Koenma states that an S class has the POTENTIAL to destroy a planet, this means that they might be able to charge up to a power level of 36,240. So by dividing 36,240 by the charge up rate of 3.26 we get 11,117. So theoretically any DBZ character that has a power level of 11,117 or higher would be considered an S class.
So the very first S class characters we see in DBZ are Vegeta and Goku after King Kai's training in the Sayain arc. So pretty much every character introduced in the Namek Saga and beyond is an S class in Yu Yu Hakusho.
TL;DR
S class demons have power levels of at least 11,117 in DBZ power scales.
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