3Delight v Luxrender
Lux can give great realism, but does not use the remarkably flexible shader system Daz uses in 3Delight.
A good 3 point light light or Uberenvironment setup can be highly realistic too,
1st is a 3 point setup in 3Delight.
2nd is a Uberenviroment setup in GI mode with a light plane an distant specular light.
3rd is a 34 Mb ibl in Lux.
4th is a 20.Mb ibl in Lux.
Images remove for nudity. Please refer to this for details. http://www.daz3d.com/forums/discussion/6_2/