Improving or personalising?
Derek Cohen (in Perth, Australia)
Bill, I am not convinced ... and you do not say what size chisel you are using. It is relevant.
There are many different types of chisels, and many preferences among users. For a start, I have chisels I prefer for chopping waste, and chisels I prefer for paring. The all rounders (that do it all) we refer to as bench chisels. Even among them, there are variations in what one is better at than another.
The bench chisels I turn to for chopping dovetails are Koyamaichi white steel and Veritas PM-V11. The ones that I prefer for finer detail are the Blue Spruce (A2) and Marples Boxwood (O1 ... what I refer to as O1 here for all chisels probably has variations, but it is close enough for the purpose). I also have another set of chisels, Stanley 750 (vintage ones I modified slightly ala LN, but these are O1).
1/4" chisels: Koyamaichi, Marples, Veritas, Blue Spruce, and Stanley



3/4" chisels: Koyamaichi, Marples, Veritas, Blue Spruce, and Stanley



Some details: thickness (in mm) at start of blade vs start of bevel
Koyamaichi 1/4": 8.5/5.4 ..... 3/4": 8.0/4.7
Marples ..... .. 4.3/2.5 ..... 6.1/3.6
Veritas ....... 5.0/3.0 ..... 7.0/4.1
Blue Spruce .... 3.2/3.2 ..... 3.2/3.2
Stanley #750 .... 8.7/4.2 ..... 6.6/3.7
In practice, when paring, there is a little difference between the 1/4" Blue Spruce and the 1/4" Veritas. I prefer the BS for very fine work, but I very much doubt that another could say the same without a direct comparison. The BS is a very slim blade, and there is no other that comes close. The Marples is next best in regard to slimness and lightness. These are great chisels in the hand. Their downside is that I do not like using a hammer with the BS, and the edge holding of the Marples is not remotely in the same universe.
When using a mallet/gennou, The Koyamaichi come out on top, not just because they hold an edge longest, but they are designed to be used this way. The Veritas come second because they are well-balanced and hold an edge almost as long. None of the others come close to these two.
Now the 3/4" chisels are a different ball game. Frankly, I'd rather use a proper paring chisel, such as the Kiyohisa I have. However, if using one of these to pare with, I'd go with the Stanley and the Marples - because of the long handles. Having decided this, I now look at the dimensions and notes that their blades are slimmest at the bevel end, and overall they have a similar size. My least favourite for this task is the Veritas, as it is chunky, and the Blue Spruce, because it is too small. However, using a mallet/gennou, and I would reverse the Veritas in this. The Koyamaichi and the Veritas feel stable and solid to hold and hit.
Regards from Perth
Derek