But that's just it, you're imagining it, or at least imagining that is due to the chisel part as opposed to the zero part. Many people tend to think that a chisel grind just cuts a V grind in half, and must therefore be twice as sharp; but the alloy doesn't change---154CM would be exceptionally weak with a fifteen degree edge, whether that was ground all on one side or 7.5 degrees on two sides. You'd see tear-out and fracturing on fairly mundane cutting tasks. So, when knife makers do chisel grinds, they grind the one side to a higher bevel angle than they would if they were doing two bevels. A friend of mine who has a collection of custom chisel ground knives didn't believe me until the digital angle finder validated what I'd told him---that most of his chisel ground edges were right in between 25 and 30 degrees, and some as high as 45. Now, there ARE some advantages to chisel grinds---they do make it easier to scribe a line with a straight edge, they allow a thicker blade to get "closer" to the work (very easy, for example, to fillet a fish with a 1/4" chisel ground knife where it can be more challenging to do the same with a conventional V grind of the same dimensions), they are apparently easier to sharpen for the sharpening-challenged, and they require one holy hell of a lot less skill by the maker to achieve a satisfactory aesthetic because the two sides aren't supposed to match. And I'm not saying you shouldn't like them--I have a couple Jimmy Fikes customs and like them very much, but they cut so well because the edges are so fine and the cross sections are so thin, and the transitions from primary to secondary bevels are so smooth---if they were V-ground in exactly the same way, they'd still be just as sharp, not to mention easier to cut in a straight line with.
If Emerson Vs are more obtuse than Emerson chisels, it's because they chose to grind the chisels a little thinner. Give me twenty minutes with the V-grind, I'll drop the included edge two degrees lower than the chisel ground ones, and then watch it pull away.
Edited the beginning for clarification. Edited AGAIN for spelling, damned pre-coffee brain.