Comparing two things based on a seemingly common denominator gives the allusion of a fair assessment. Comparing math test scores of one set of kids in one district, in one state, with those in another district, in another state may seem like a good way to assess each, but tests ignore way too much.
Comparisons at most times are completely arbitrary.
What does it matter if someone is smarter than you. Faster than you. Stronger than you. There will always be someone x than you.
Better to use those around you as motivation for improving the things you care about.
Better to see and track where you where just yesterday and be better than that. To be better in a areas that matter most to you. Why let comparison get in the way of what you really want and need.