Kv is only half of the story of power, it's just a RPM rating. Without knowing torque the question can't be answered (other than possibly comparing similar motors)

Power = torque times RPM (with appropriate units and radial conversions)

Power is what makes a motor fast. And determines acceleration.

Not torque or Kv/RPM by themselves. Can be used to suggest best gearing, that's about it though.

Torque can vary substantially due to a variety of factors in how the motor is built, materials, etc.