Thanks to fellow forum member Lefty, I've had an opportunity to use the "pettysuki" that he had Pierre make for him. These are some of my impressions of the knife.
It was Lefty's idea, brought into existence by Pierre, to make a longish, wa-handled utility knife with a sujihiki-like profile. S35VN was chosen as the steel, despite Lefty's love of carbon steel. As you can see from the pics, Lefty and Pierre made sure the handle is a stunning piece of art.
The blade is 179mm long, with a cutting edge of 169mm. It has a moderate amount of distal taper, with the spine measuring 2.55mm at the heel, 2.05mm at the midpoint and 1.10mm 5mm from the tip. It is 41mm tall at the heel, providing plenty of finger clearance for board work. Weighing 138g, it balances 10mm behind the front edge of the ferrule. The handle is a full-size gyuto handle, rather than a scaled-down petty handle, and may or may not suit your preferences.
Lefty designed this knife to serve as an all-purpose utility that could also be pressed into performing gyuto-like tasks, and it excels at this. If you like using a 150mm petty for a lot of what you do, then you'll love this knife. I found it to be the best knife I could imagine for making sandwiches, from slicing tomatoes to cutting a hard roll in half.
Edge retention is exceptional. I used the knife for almost two weeks before it needed to be touched up on a loaded strop. I still have not found an excuse to take it to the stones.
Anyway, many thanks to Lefty for lending me his "child" and to Pierre for making it.