Only two reasons I can come up with to choose 154 over 20CV (basically M390) in an S!K:
1. Nicer polish
2. Ease of sharpening (but I don’t see that as an issue with the tools available to us today)
(3. Rarity-factor - collector’s piece)
20CV should hold its edge quite a bit longer. In anything bigger than the 4.1/4.7 I’d probably stick with D3V.
After years of looking at them I finally decided to search for one and buy it
Got it in the mail today, a 4.1 in 3V - Excellent!- Can't wait to actually get out and use it!
Hoping to grab a few other models at some point.