Studies on Grass Finished vs. Grain Finished Meat

Oddly enough someone sent me this one when trying to prove that there wasn't any nutritional difference between grain and grass fed meat, but it shows quite the opposite, with differences in everything except protein and mineral content:

http://www.sciencedirect.com/science/article/pii/S0309174013004944

This article goes on to show a link between the consumption of grass fed meat and the blood tests of the consumer.  I think this study was particularly well done with the management of the meat animals monitored by the study to reduce confounding factors:

http://www.ncbi.nlm.nih.gov/pubmed/20807460

We do still lack definite knowledge of how all those blood tests affect final health, but I know eating grass fed works well for me.