Same situation, my wife and brother in-law prefered my vg10 Delicas, over the zt450 and the 940-1.
I honestly think the Delica is the best cutting, very thin flat grind is awesome.
Personally, I prefer the 940-1. More robust
Lately I have been enjoying a more carefree cutting attitude that the thicker 940 can hold up too.
Things I would consider abuse the when carrying a Delica the 940 will just eat it.for instance yesterday I used my 940 to cleaver through a plastic buckle.
The Delica is awesome but requires more judicious use to prevent destruction due a perceived sense of fragility due to the thin blade.
I sure it's fine, and they do make a saber grind version but I think the flat grind is perfect.
I really enjoy the 940 handle, most comfortable to me it is neutral in design and acceps multiple grips with out getting in the way.
Love the axis lock, fast and smooth.
the blade design is my favorite. It's not a great slicer but gives alot of confidence for hard use. I also enjoy the steel used on the 940-1 holds a great working edge and hones good on ceramic.
S90v is not the best steel for a pocket "razor" but it is perfect when you need a knife that keeps cutting rather then blunting.
It not that it can't get razor sharp, it can, it's just it seems to draw back from the advantages of of this steel by smoothing out the teeth to a high polish.
It also cuts with authority when extremely sharp. Very aggressive.
Cracks a smile on my face when I get to whip it out and shred something
Seems to excel with a toothy edge, low finish, or a polished toothy edge.
Again it's very sharp. You can whittle a hair even though it's not completely mirror polished. You just need to polish the teeth not the entire apex.
Conversely
VG10, I love it, I bring it to a higher edge finish ( 6k) and keep it hair popping sharp with strops. But with lots of cutting it just stops cutting. Blunted. But is super easy to sharpen, just stubborn to debur at times.
Cleaner cuts but less endurance.everything is trade off.
These are my two favorite folders, the zt 450 just has the best action and is very stylish.