Here is a review from PC Gamer, a reputable review site, that was completed a month ago. The 7600 beats the 1600x by about 15% on average. The 16 games tested, only one game did the 1600x beat the 7600k and that was by 1.5fps.
http://www.pcgamer.com/amd-ryzen-threadripper-1950x-1920x-review/