The 4th generation i7s are the fastest laptop processors. Like the i7 4910mq.
The i7 4770k is the fastest cpu on the market in single core performance.
There are 12-15 core Xeons that would truly be the fastest overall cpus.
there are also the 6 and 8 core intel chips, while expensive, are not totally unheard of in the consumer market. for single core yes, the xeons like mentioned above (and trust me theyre priced accordingly)