Just a stat comparison

Late game: I was playing kassadin mid: full stack roa + lich bane + zonya + void staff + sorc boots Against zed : draktarr + Malmortius + mercury + idra + yomumu Kassadin is supposed to be strong late game. Zed is supposed to be squshy and almost good late game He had more ad then my ap. Even with m.pen i had to consider him tanky (too many magic res.) If His ult was up (one minute): my zonya was in cd. (one minute and half) . I won my lane 4-2 against him. After hexdrinker i had to avoid fight with him.

Fortunately both zed and malmortius are planed to get some nerf. Ad mid has too easy access to tanky stat + damage items. While ap have to choose: damages or defense.