ArikadoSD
the cream of the crop
This is imo Sheik's hardest matchup. Maybe not the worst, but definitely the hardest. Any mistake while we're at 60% and we're dead. All of Ryu's moves do triple or quadruple the amount of damage Sheik's moves do AND he has superior frame data. His fair does 15% while +3 on shield (meaning he practically can't be shield grabbed unless power shielded) while ours does 4.3-5% and is only +1 on shield. His nair is +7 on shield while only having 6 frames of lag, bair is +6... basically we practically can't punish any of the said aerials on shield seeing all of them are + on shield and his utilt comes out frame 3. His true shoryuken is invincible frame 1 meaning Ryu can use it to escape/punish fair strings at low percents.
Sheik has to play ABSOLUTELY flawlessly in order to win or else she simply won't. As I said any mistake at around 60% and your stock will be gone. The only thing keeping Ryu from dominating Sheik is that his neutral is somewhat lackluster and he is slightly bothered by needles and fair's range and the fact that uair is a multi hit move so he can't focus attack through it. I found crouching to be a really useful tool in this mu because it can avoid utilt and all forms of hadouken but dtilt still hits it. Our own dtilt is pretty good in this matchup for the same reason as well. Walking to dtilt and crouching in general is pretty good.
His low recovery can't be challenged so for that reason it's best to somehow force him to recover high by taking his jump and forcing him to side b to recover. If he does that then Sheik can bouncing fish him until he dies.
good resources:
https://docs.google.com/spreadsheet...QC4DJiKUVN1s3jxsOlzBuyZdMo/edit#gid=524475654
http://kuroganehammer.com/Smash4/ryu