http://inspire.stat.ucla.edu/unit_15/NEJM2082.pdf
Here's one stating the year follow up showed no significant differences between low carb and low fat diets.
unrestricted calories for the low carb group, severely restricted calories for the low fat group. low carb was superior for most of the duration, although adherence was relatively low. participants in the low carb arm were instructed to increase carbs steadily, although i'm not sure why, while still being on an unrestricted calorie diet. Look at the A-Z study by Stanford. Low carb outperformed low fat and the other diets at one year, especially in those with insulin resistance where the difference was pretty profound. I have yet to see a study in which low carb compared unfavorably to low fat. I've seen numerous studies in which low carb diets were significantly more effect than low fat diets.