I found them maybe a little snugger than the 5.11 taclite pros, but in more of a "uniform cut" with a straighter, less tapered leg. But I am only familiar with the taclite pros.
I didn't buy them for the sole reason that I have 5.11 knee pads that I wear in my work pants, and I just needed new work pants.
However, I was immediately annoyed that I did not need another pair of pants, because the vertx pants were really, really nice. They are stupid comfortable. When I need more pants I'm definitely getting a pair.