Are you V-ray for SketchUp user? and feel that your rendering quality still sucks? 

Are you thinking that this might be because the render engine?  

Stop right there! i know what you feel, because i've been on your position. 

this is my story about couple years ago when struggling with V-Ray for SketchUp to generate a high quality rendering and how do i feel know.  

wish you guys the best of luck in the future.