Wait, back up a little. TFA was mastered in 2K? Wasn’t it screened at 4K? Was the DCP an upscale?
According to IMDB, it actually is 4K. http://www.imdb.com/title/tt2488496/technical
I was misled by this article, which says 2k http://redvdit.com/reviews/star-wars-force-awakens-blu-ray-review/