From the manufacturer:
The best way to know how well a pickup will perform is to play it in the real world. That’s exactly what Mark Morton did. He toured and recorded in Lamb of God with Dominion™ pickups in his main guitars for over two years. Mark’s confident they do exactly what he wants, and what he wants are pickups that work hard and sound great.
Mark’s primary requirements for the neck pickup are that it coordinate with the bridge position and produce a well-balanced, clean sound. The Dominion™ Neck model is a little hotter than a typical vintage humbucker, and it has more edge and speed, to keep up with the Dominion™ Bridge model. Mark favors a thick amp sound, so the Dominion™ Neck model has a good amount of presence for definition and focus.
Ethan's picks for best videos/sound-clips:
This video demonstrates some of the crystal cleans you can get with Mark Morton's signature neck pickup -- the DiMarzio Dominion. The rhythm sound in this video demonstrates the pickup in a split-coil position, resulting in a clean strat-like sound with great high-end sparkle and presence. The lead overdub tone is the same pickup in full humbucker mode, sporting a well-balanced and fat PAF clean sound that has a lot of warmth and definition. A lot of players use the Dominion pickups for heavy gain applications, but you can't underestimate the brilliant cleans they can also produce.
The player is using a Jackson SLS3 through an Avid Eleven Rack directly into Pro Tools.