The Katana really handles drums well, any and all drums. Kick drums in a drum kit, timpani, tabla, all layered, realistic bass goodness.
Not boosted, but very good bass presence and depth.
It handles heavy metal, symphonies, ragas, pop, and string quartets all excellently.
Clarity is very nice and the Katana does it with a nice, natural note weight, avoiding the thinness you often find in detail-oriented earphones.