Is it possible to beat a team that is 40% better that you? 30%?

I am in the last leg of the current Kings... event. More than half of the teams are within 5% points of each other. Three about 10-15% below. One poor guy way in the bottom but also one guy 40% better than the second tier. Is it even possible to beat a guy that is 40% better?

I thought I would start this poll to see what is the largest quality difference people have managed to defeat.

For me: ˜15% I think is the highest I have ever overcome.

Anyone else?