Check it out – I did a sharpness test with this beautiful sujihiki knife that I got from Syosaku:

Awesome! Grape tomatoes weigh almost nothing, so that blade is sharp as hell!!!

I whipped it out at a cookout last week and it was a hit. Check out the prep and also the final slicing here, with some tenderloin tail tacos:

These knives are great! If you think you want to buy one, follow THIS LINK.