Even though I'm pretty sure this specific katana is mostly cosmetic or ceremonial, if a Sabre's curved hilt has a better grip would a real, well designed katana also benefit from a
How Long Is a Katana? - Medieval Swords World
Why Are Katanas Curved? - Arma Blade
Sori
Modern Full Tang Carbon Steel Tachi Battle Ready Curved Blade War Katana Sword | eBay
Blade and Mounting for a Sword (Katana) | Japanese | The Metropolitan Museum of Art
Craftsmanship and Differences of Katana Curved– COOLKATANA