I have the 26 cm and the 16 cm version of this knife (4584-26 and 4584-16) as well as the thinner version of the 20 cm knife (4582-20) which has been my go to knife in the kitchen for years. This knife is now my most used knife. Much as I like the lighter version, this knife is outstanding. In my opinion the balance is perfect and the extra weight actually adds to the ease of use for practically any task.
One thing, I thought I was buying the older version of this knife which had 4584-20 and the alloy X50 CR MO V15 marked on the blade. The knife I received was the newer edition which has Made in Solingen Germany/22 marked on the blade. Something I found a bit strange was it shows as Made in Solingen/Germany/22 rather than Made in Solingen/Germany/20 which is the marking on the website picture of the blade. I couldn't find any information on line for this particular code. As for the alloy marking no longer being shown on the blade I was wondering if Wusthof was using a different steel on the new Classic line but again couldn't find any information on line, perhaps Paul might have some insider info?
I have included pictures of my new knife and my lighter version of the same knife which I've been using for years I do highly recommend this knife and dealing with Paul is always a pleasure!