So about those Katarina nerfs.

While malz is considered a counter to zed, there's plenty of counterplay that zed can use on him to be able to dominate lane (even if this is a greatly difficult match for even a skilled Zed vs a skilled Malz), Kayle has a lot less counter-play post 6.

She doesn't out-burst zed, but can easily avoid or negate all his poke with W and a as second item, pokes harder with E even if it's only splash damage. With 40% CDR, her E's up all the time (30% items, 5% masteries, 5% runes). Really, your only hope as zed in that lane is to bait out her ult by getting her low enough then ulting on her face.