Update on this thread for anyone in the the future with a similar question:
I bought a Konosuke HD2 Petty 180mm (edge length roughly 170mm) & Shibata Koutetsu Ko-Bunka 135mm (edge length 140mm).
Here is my opinion as a home cook:
Main thing I used it so far was fat trimming, silverskin, and slicing small cherry tomatoes. The main differences besides length would be blade height & flex.
Konosuke is 29.6mm blade height from heel and has slight flex from the 1/2 - 1/3 of tip.
Shibata is 41mm blade height from heel and is a stiff blade throughout.
-Cut of beef I used was beef cheeks and water buffalo flap/skirt steaks. I used both knives on the cuts of meat.
- Konosuke was great on silverskin on flap/skirts. It was nice having the extra length and using the whole edge. The slight flex helped me out in getting underneath the difficult parts of the silverskin.
- Shibata was better for beef cheek fat IMO. Fat on the beef cheek I buy is difficult to trim and having the stiffness was beneficial as well as the k-tip helping out. Felt like I had more control using it
- You could pick your poison on either for tomatoes. The difference is blade height for your personal preference in knives. Both were equal to me besides drawing blood on my ring finger with the Konosuke. It was a simple and easy task so this to me is not a factor in deciding
I have yet to break down a chicken/duck as I still procrastinate on buying any whole birds. I will try to update in the future on a comparison for whole bird breakdown. I will also be testing more smaller vegs and some fruits when everything is ready to pick from my garden.
I still cannot decide which one I prefer more, they both have their benefits.
Take my opinion/review with a grain of salt as a home cook. There are people on KKF that have more years of experience than I have probably been alive.