the DAZ line is limited when it comes to rendering, compared to renderers like mentalray, vray and the like. But you shouldn´t forget, that there are also many other tools being used in those examples, Bodypaint and Photoshop to name two.
A talented person might get similar results with DAZ, or Blender, or whatever. But there is a reason, why on a professional level other tools are used. And as you see, many tools where used, each for the task it is best for.
If someone wants to really get deep into 3D without spending a fortune, I always would recommend Blender, as it can do everything. DAZ tools are more "special" tools, similar like Vue and Terragen for landscapes.
Another option and worth a look - as hobby user you can get Houdini for almost nothing and it is for sure one of the most versatile tools out there. But it´s of course also very different.
So I am sure, the artist could have done similar with almost every 3D application out there - but it would have taken more time.