Oh! So did you fly the Su-35, PAK-FA, and the F-15C Golden Eagle so that you could tell the difference? Hmmmm... I'm guessing no. :P Even if you did read "classified data" and stuff, it says absolutely nothing... read-world (read wartime performance) performance differs quite significantly no matter what your classified data tells you. In the end, pilot skill matters the most no matter what aircraft you fly. Even a Su-25 can take out an F-15C, if the Su-25 pilot is better and vice-versa, an A-10A pilot can take out a Su-27S, if the A-10A pilot is better.