Maybe. They'll be lighter but they may feel worse due to less volume and higher pressure. The thing with tires (as with everything), it's all a compromise of one aspect vs. another. Marathons (of any width) are very long lasting and provide excellent flat protection, which is why they are so popular with tourers and commuters. They are also heavy and slow feeling compared to a supple racing tire, so you don't usually see them on race bikes.
If you want fast and supple, you'd choose something like a Continental GP 5000 or Vittoria Corsa. I think you'd really feel the difference there, but you won't have the flat protection of the Marathons.