Originally posted by Juntai
Superman wasn't actually serious there. He was just surprised by it. It's nothing new. He does it when the less powerful whip up something nice. He even paused to marvel at Deathstroke's speed before.Superman has chased down and caught and outran every single Flash on several occasions.
Barry himself said he believes Superman holds back the upper end of his speed, keeping himself just around his level on purpose.
Wally has said pretty much the same.Barring speedforce related effects [time travel, dimension hop, etc], Superman is faster.