My Dozier Straight Utility has a very thin grind, and cuts like crazy on stuff such as cardboard and carpeting. Bob's D2 also cuts for a long, long time before sharpening is needed. Id put my PCKS BG-42 Buck 110 right up there with the Dozier in terms of cutting efficiency. It doesnt hold its edge as long as Dozier D2, but is still pretty good. My BG-42 Sebenza runs in about the same league of cutting efficiency as the Buck 110. It doesnt hold an edge like the Dozier, but longer than the Buck. Thin hollow grinds make awesome utility knives.
I like to use convex grinds for outdoor work. They whittle wood very well, and are a bit more durable than hollow grinds. My Blackjack Small and Marbles Trailcraft both have thin convex grinds and cut like theres no tomorrow.
I dont normally do flat grinds, as I dont generally like the sharpening drawbacks. I dont like the way that the blade thickness behind the edge bevel thickens with repeated sharpening. But I do have a couple that are quite exceptional. The BM 710HS came with a very good flat grind from the factory. Its a good slicer. The Camillus EDC also cuts quite well, especially the talonite version. Talonite is some amazing stuff, adding its own unusual properties to the mix.
I will note that Ive managed to chip all of these blades, at one time or another. Thats the price you pay for a thin edge. Such is life.
Oh yah. Ive got numerous slipjoints that possess awesome cutting efficiency, just because they tend to have thinner blades. The Buck Cadet, Robeson wharncliffe whittler, and any of my SAKs are sensational slicers.
The famed Opinel is also an awesome cutter.