One KNC Jupiter is likely more powerful than every CPU miner combined (including botnets).
Probably true. A Core i7 3930K can get to 66.6 MHash/s, but almost nobody has one of those. At 6.7 MHash/s (mining speed of a Core i7 2600K), it would take over 82,000 CPUs to match the Jupiter's 550 GHash/s. Although the largest botnet ever had 30,000,000 bots...
There is no "vs".
Which is faster a bicycle or a jet airplane?
Not a good analogy. 100,000 bicycles are still slower than a jet airplane, but 100,000 CPUs could match a Jupiter.