Whereas it is certainly healthy to be competing against one or several colleagues in your area, there is only competitor that you really need to focus on. Thats's right...take a good look at yourself every day in that mirror and say hello to your best competition!
Stop looking over someone else's shoulder at whatever and however someone else is doing. Focus on your own success and development and be on the lookout for ways to improve your own performance.
If you follow this thinking through to the end result you will come to understand that as you get that momentum going to constantly improve and perform you will most likely pass any colleagues along the way. However, you will only ever be as good as the last performance you turned in and therefore still have all the reason in the world to strive for more and more excellence in everything you do.
Competing against your own past performance will keep you sharp and focused and provide a healthy sense of encouragement from within.
Go ahead...give it a try...and call me with your results!