Maybe I can help you make your point. I selected a picture from LR4; without making any changes I exported one copy as 100% JPEG and a second copy as NEF. The NEF copy was then processed with default settings in DxO, version 7.5. The picture was taken with D700, 24-20@24mm and I used 100% crops. In case it is not apparent, the first version is the LR4 default, the second picture the DxO default.