All the ones I've seen without are great looking.
Likewise, all the ones with a total re-paint PLUS the Hayabusa Character also looks fantastic.
I guess the bike has enough "presence" with or without.
However, I do think the Character "Adds" more than it takes away from the total effect keeping in mind that calligraphy is actually an ART FORM and the sensuality or manner of each stroke when made, reveals a certain animosity or "aliveness" and even the MOOD or mental condition of the artist representing the character.
Occidentals generally miss this evocative aspect entirely.
However, it's YOUR BIKE and YOUR PASSION. It might have an IKEA look and still be the ultimate look for some people.