User blog comment:NicknameMy/My Sion Rework, every Sion viable/@comment-5592451-20130312165458/@comment-3493296-20130313164749

Yi has 0.679 +2.98% and a 40%/60%/80% steroid

Fiora has 0.672 +3% and a 60%/75%/90%/105%/120% steroid for 3 seconds on a way lower cooldown.

Tristana has 0.658 +4% and a 30% / 45% / 60% / 75% / 90% boost for 7 seconds.

You see? There are multiple champs with more base AS and better AS steroids than Sion.