They all have the same geometry/sidecut profile, but the 2011s and 2012s are quite a bit softer than the 2010s and also have added early rise in the tip and tail in addition to the camber underfoot, whereas the 2010s and 2009s are full camber. 2011s and 2012s are identical, as are 2009s and 2010s. Hope this helps
"What you are feeling is a base burn. The toilet bowl cleaner probably has a really high pH , and therefore must be neutralized with an acid that has a really low pH. So basically, you just need to stuff your asshole with the most acidic shit you can find, battery acid, sulfuric acid, nitric acid, whatever you can get your hands on. its gonna be a chemical showdown in your asshole today my friend."