Well, once you click on the challenger tier, the tabs mean (left --> right):
Champion Popularity Win rate Kill Death Assist CS Gold Not sure after that
Shen's win rate isn't so bad at all but Zed's win rate...ehhhhhhhh not too good. Korean challenger guys are saying Zed is only good in very few selection of pros and nothing more. They're saying Zed is a champion you'll get good scores with but lose the game with.