Kasumi vs Christie: Kasumi has the faster jab. Christie fights low to the ground for the most part. Both have to stay in your face to be a big threat although Kasumi does have a few space tools that folks tend to overlook (like the hoshinipo dash with P or K) & then her 9P or 9PK with a few other options . Kasumi has the faster stuns. The stuns can open up several options for her to do.
Christie has the ground that helps her get in closer to opponents, but as far range, she lacks. Both are constant pressure character except for Christie is a little bit more at a disadvantage than what Kasumi is when blocking. Both are best when on the attack.
Although that Christie does get guaranteed damage after launch, Kasumi has the advantage here because she has the stronger damage output. But both of them are annoying up close.
Not gonna assume anything, but just though I'd give a matchup that seems like a hot topic to talk about because both of them are the speedsters in this game.
Note: Unless you're Mr. Wah , Allan Paris, CyberEvil, Rikuto etc, If you have a problem with this post, tell me why & more power to you, but don't base anything that's happened online or I'll dismiss your input.