There are slight variations in your lines, but this is what a normal person would call great linework. They are only there if you look closely, but the contrast in value and the boldness of the pattern doesn't let you. It only allows focus on the design itself. Very well done.
Oh this is still traditional art mate. Its just traditional styling with modern tools. That program I linked vectorizes your image. You can then open it and manipulate the lines with precise control. Any time you see lineart with perfect lines its probably not a badass artist, its just a guy that understands vector art.