I don't have 5 so I don't know all that was added to poser 6. Do you have dynamic hair and cloth? I think the material room was updated, but that is irrelevant since you can't import procedural textures into Carrara anyway. If you like doing animations then the cloth room is nice as dynamic clothes move more realistically in an animation. Dynamic hair renders best in poser but some tutorials are around that explain how to get better renders in other applications.