Is it true? Well as an avid photographer and tech geek I will say I do believe that Nikon's have had the upper hand over Canon for some time. I used both in a production setting so I am not just saying this. I been able to compare up close in both shooting and post.
Here is a link to maybe why? What do you think?
http://www.trustedreviews.com/news/nikon-d500-camera-of-the-year-trustedreviews-awards-2016