80/20

So I've learned that supposedly 20% of the people do 80% of the work and 80% of your effort on a project is required to reach the last 20% of excellence. These days, i'm starting to feel like the last 20% of excellence in ministry is necessary for 80% of the results. Like i can have an 80% ministry and only get 20% of the results i would get if i had a 100% excellent ministry. Has anyone else observed this?