Is Derek Barnett Really That Good?

[Hammerstripes]

The more I look at this guy, the more I am starting to wonder if he is better than the following guys:

Lawson
Harris
Williams
Willis
McKinley

I've watched the above guys play more than a few times, and it seems that they all have more explosion and just as good of an overall pass rush as Barnett. IS there really that much difference between those guys and Barnett?