Daz3D has had the Iray renderer out for a while now and as many of us older DAZ3D users know, there's a Bandwagon out there with a lot of new Daz3D users who think there are the next best thing when it comes to 3D art. This is of course is not the case as unlike (3Delight) the older renderer, you can use Iray right out of the box.
But Iray is like playing the guitar; Easy to learn, hard to master.
A simple thing like the human eye can look superb in Iray, it's about how lights react to the materials you put in front of them and how the materials react to light. And you tell Iray how to react to light and material, then you learn.