The Katana NT is one of the most comfortable-feeling basses I've ever played; the way the neck radius feels (which is very flat) along with the ebony fingerboard is perfect for my style of playing. I also enjoy the maple top/ swamp ash bottom combination for the playing I do... it is not very deep or murky compared to many other models, but there is very usable, defined low-end. I would call it a very "balanced" sounding instrument.
That said, I don't play the Katana NT. I play the Vampyre NT. They are pretty much identical in terms of the woods and string set-up. The maple/ash/ebony/wide radius... tone controls... the whole bit. They're very, very similar.
So why do I play the Vampyre instead?
1. the pickup configuration. The Katana has two J pickups, but the Vampyre has the TWIN jazz pickup in the bridge position, and I absolutely LOVE the way the twin jazz sounds. It has increased gain that brings out the overtones of the string over the bridge area, and I use so many percussive techniques and harmonics, that this is a must for me. In fact, my custom bass has two twin J's.
2. Although I think the Katana is one of the most comfortable basses to hold, I also think it is the UGLIEST body style I have ever seen. I mean... it has a BUTT. I guess some think it looks sexy... eh. I'm not judging. :wink: