Hi Ray,
I own only one Wusthof knife, a classic ikon creme 16 cm chef so I can only compare to that one live here at my home. I have here the 6 inch K sab authentique new prod olive handle stainless chef and a 6 inch old old stock nogent carbon chef. The taper on all three of these is very close the same, the Sabs seem a tiny tad thinner spined.
Here in the next photo I then have the Wusthof again among a bunch of more K Sabatiers, which I bought directly from K Sab, the site you linked also.
Left to right:
Wusthof classic ikon creme 16 cm
8 inch new old stock carbon nogent
10 inch new old stock carbon with plastic handle
10 inch new old stock stainless Canadian
10 inch new production au carbone olive
11 inch new old stock carbon nogent
The old stock refers to the antique series’ on their site. Authentique is new production.
The pictures may not be perfect, but there is taper in each of the Sab old stock blades I have, but they aren’t all the same. The plastic handled old stock chef is notably the thinnest of the lot, it tapers quite thin indeed, “laser” thin basically.
The Sabs are what I have been reaching for the most, more often than my several Japanese knives
