7D II AF sensor specs. http://www.brochures.canon-europe.com/getFile.php?productid=9090&languageid=-111
1Dx AF sensor specs. http://cpn.canon-europe.com/files/education/technical/eos_1d_x_explained/AF_guide_EOS-1DX_eng.pdf
It took me all of about 5 minutes to find the difference.
No matter what difference you're talking about (there are several), none of them come anywhere close to correctly being described by the term "light years". And several of those subtle differences are in favor of the 7D Mark II, including coverage.
No sweat. Enjoy your new 7D II. I personally will pass.