Even though I just got them and haven't done any tough cutting I can give you my initial impressions on their build quality and appearance, etc.
I opened all three knives up and laid them out. Actually these pictures I posted were real time from my desk at work because I had them shipped to my office.
Initial impression:
They all came very sharp and not overly toothy for being the factory edge
The D2 blade, when held at an angle to allow the light to enhance the blade, appears to be a little less smooth as if the machining process is more difficult with the D2 than the 154CM. The 154CM blades seem ever so slightly more refined in their finish.
The 154CM blades were a tad sharper than the D2 as shown by push cutting paper. It could be that their edge is just smoother and not as toothy as the D2. They just seem to have a slight sharpness advantage.
The two 154CM knives have perfectly centered blades
The D2 knife is slightly off center but not enough for me to mess with it.
I'm not sure if this has to do with the person who assembled them or if they were assembled with more care when they were built or if the D2 blade is not perfectly straight. Regardless, it's minor and the the D2 knife will be the one I carry and abuse first anyway.
The two 154CM knives seem smoother to deploy while the blade play was still non existent. The D2 blade took slightly more effort to flip fully open with my thumb. I tweaked the pivot screw on the D2 knife a little back and forth but could not quite mimic the smoothness of the 154CM knives. Understand this difference is slight but there. I tend to wonder if this is because of the friction coefficient is different between 154CM and D2 or perhaps the D2 is microscopically not as smoothly finished at the pivot point. Just grasping at straws here.
The fit and finish for all three knives is perfect except for the slightly off center blade on the D2 knife when closed.
I stropped all three knives to fine finish their blades and as expected, the 154CM knives came out noticably sharper acting than the D2 in the same amount of stropping time.
All in all I think I prefer the 154CM knives but because the D2 knives are current production I'm going to carry that one first.