Someone recently characterized for me one way leaders are evaluated.  This certainly isn't the only way and it doesn't catch everything, but it is a good place to start.  The list is succinct and the questions thought-provoking.  Here is the list:

• Results – How is your day job going? 
• Leadership – Who do you make better?
• Strategic Insight – How far out are you thinking?  A few days?  A few months?  Several years?
• Scope – Who is changing because of you?  Your team?  Your group?  The company?  The industry?
• Sphere of Influence – Who is listening to you?

These are good questions to keep in mind when looking to advance one's career into leadership.