It seems like part of the natural order of things for us to compare ourselves to others but this wonderful tinybuddha.com article discusses why it is best to redirect that thought process.
Stop Comparing Yourself to Others: An Alternative to Competing with People
Some highlights are below:

• “The thing about comparison is that there is never a win. How often do we compare ourselves with someone less fortunate than us and consider ourselves blessed? More often, we compare ourselves with someone who we perceive as being, having or doing more.”
• “So, when you catch yourself comparing yourself to another, stop for a moment and re-direct the thought. Instead of submitting to the temptation to compare yourself to someone else, ask yourself a few questions, instead.”
• “What are you doing today that you couldn’t have done 5, 3 or even 1 year ago? How have you stepped out in the last year that you might have found inconceivable before?”
• “What are your wins this year, compared to last year at this time? How has your life improved? How have you improved? What have you done recently that you never thought you could do?”
• “What negative behavior have you stopped engaging in, that you never thought you could quit? What positive behavior have you been engaging in that up until now, you have resisted?”
• “…how have you continued to become a new and improved version of yourself?  That’s the stuff that counts. Comparing ourselves with someone else is an inaccurate and irrelevant measuring stick.”