Herobizkit
Adventurer
A katana has been traditionally compared to a slim (masterwork) Bastard sword in most earlier editions. But stat-wise, you're not wrong.Personally, I really wished they had included a katana on the weapons list as well. 1d8 slashing damage, versatile (1d10), 3 lbs, 25gp. In other words, identical to a longsword, but +10 gp pricier. Because it's just a sword.