I have not seen these thin bladed knives mentioned.
The Syderco Moran. One of the sharpest knives out of the box I have ever received. (VG-10)
I don't have the following, but Joe Talmadge swears by the Deer Hunter, which is good enough by me.
The A.G. Russell Deer Hunter, Bird & Trout, and without looking probably his Woodswalker. They also sell a fruit knife with a long relatively thin blade. When I get it sharp I'll see what I think.
You could probably get some boning knives out of your kitchen, other fillet knives, ...