This is useful info, thanks. Though at the point of the thumb it seems like both are pretty close since the non-Pixel model seems to have a wider cutaway throughout the length of the unit and where the thumb rests it seems like the cutaway width is close. The cutaway width doesn't look as pronounced because it already started wider.
I never had them at the same time to compare, but this is likely true. Maybe psychological, or maybe just feels like a firmer grip with my thumb in a cutaway area - I just know I immediately didn't like the neewer one, and the pixel feels great in my hand. But, that's just an opinion! (and we know how terrible opinions are)