Base Zoro speed has always been better than Luffy. Luffy needed G2 for CP9 speed. Zoro was using the same speed he always had and fought Kaku and Jabra.
Zoro beat Brook, who is confirmed to be the fastest SH. He beat Brook who was amped up on a stronger body.
Zoro was dodging lightspeed attacks from Kuma, and didn't get stomped even though he was already badly injured.
Enraged G2 Luffy got immediately stomped by Kuma.
Zoro and Brooks attacks are basically teleportation. Luffy has no feats of such manner.