My 2 cents...
First, I think you've hit upon a fundamental difference in knife design: flat handle vs round (or squarish).
IME, flat carries better. Much better. When I have to be in dress pants, I reach for this Buck 500.
Buck 500 Duke and Micra by
Pinnah, on Flickr
But, IME, round/square give me a better feel in my hand, particularly if I'm going to be using the knife for a long time or cutting hard materials. Of all the knives mentioned in this thread so far (that I've used), a modified Opinel #9 gives me the best feel in the hand. Note, I sand the sides down for better pocket carry and better torsional control and I round off the butt end a bit to get rid of a hot spot in the heel of my hand. With these mods, no folding knife I've used comes close to the feel of an Opinel 9 (or 10). It is also the most rugged. But on the downside, it's the most fiddly. You need to tune the joint and melt wax into the wood there to control swelling.
Opinel 9 Inox and Micra by
Pinnah, on Flickr
For general light use, the classic Sodbuster is very nice. It's a great a table/food knife (as is the Opinel 9). But several things frustrate me about it. First, the handle is too small around and I can't get a firm grip on the knife when hard cutting. The taller handle of the Buck 500 is actually much better for hard cutting, despite being about 2mm thinner. The Buck 110 is also better in the hand. Also, after living with convex grind of the Opinel, the flat grind of the Sodbuster just doesn't keep up. I carry the Sodbuster occasionally but always come back to the Opinel.
Case Large Sodbuster and Micra by
Pinnah, on Flickr
Regarding the term "gentleman's folder", I think this is an emotionally charged term. I think most folks would consider the smaller brother of the Buck 500, the Buck 501 a "gentleman's folder". When I hear the term, I generally think of fancy pocket jewelry. Classy in a Jaguar or Mercedes way, which is to say a bit effete for my tastes. Other words are ostentatious or simply trying too hard.
I don't care if somebody thinks I'm a "gentleman" or financially successful. What I do care about is the ability to use my knife in public without causing public alarm. A modified Opinel (or a stock one with fancy wood) can be used in public in this way. Among all the knives I own, it gets the most favorable comments from non-knife people. It also cuts the best, feels the best in my hand and is the most durable.
Opinel by
Pinnah, on Flickr