Anyway:
King is a speedster...seems to be faster than Marco in movement speed while he and Marco, both have average reaction speed
Attack speed? Hybrid Marco... maybe Hybrid King will show better attack speed
Kata > King/ Marco in reaction speed
Katakuri > Marco >~ King in attack speed
Katakuri > King/ Marco in combat speed
King > Marco > Katakuri in movement speed
Marco is confirmed below Katakuri in speed overall Anyway. He's only better at movement speed coz he can fly fast.
King is yet to show his limits