An excellent tool to answer this question can be found at www.4-Dsystems.com.
On this site, home of How Nasa Builds Teams, you can find two diagnostic tools:
1. Team development assessment
2. Individual development assessment
Even if your team isn't interested, take the individual assessment anyway. You'll learn where you stand in relation to high performing teams. It's free, and takes about 15 minutes, so why not? The site also provides free tools to help you improve your performance.