Fifty sets of 225/50 R17 tires, wet and dry braking from 100kph (62mph), and the best 15 tires go through to a full tire test on a BMW 320i Touring . It's a simple concept, but it always gives us an excellent overview of the current state of the tire market.
As usual, the results are closer in the dry, with 5 meters covering 50 sets of tires. In the wet a huge 14.5 meters covers the best to worse, which is nearly 4 car lengths!
Edit: The top 15 test can be found here: 2014 Auto Bild Summer Tire Test.
The Results
braking in meters