The decision
I think knife blocks are one of the great kitchen cons. They give you a lot of knives so it feels like you're getting a lot for your money. Then you use the same chef's knife for almost everything and the other eleven sit there taking up counter space.
A chef's knife is different. It is in your hand constantly. Onion, garlic, herbs, chicken, steak, a pile of vegetables for dinner — this is the knife doing the work. That makes it one of the few places where spending more can make sense even if the cheaper option technically gets the job done.
The Shun and Victorinox are almost perfect examples of how I think about gear. The Shun is the one I want. The Victorinox is the one that makes me question whether I need the Shun. If you cook often and appreciate a knife that feels special every time you pick it up, I'd spend on the Shun. If you simply want a very good cutting tool and would rather put the money somewhere else, the Victorinox is the easy value answer.
What you're actually paying for
With the Shun, you're paying for more than sharpness. You're paying for the feel in your hand, the finish, the balance and the fact that it feels like a serious piece of kitchen equipment every time you pull it out. None of that makes an onion taste better. It can make the act of cooking more enjoyable.
The Victorinox strips most of that away. The handle is utilitarian. Nobody is going to stop mid-dinner and ask to admire it. But it is light, comfortable and extremely capable. That's why this isn't a fake comparison where the expensive thing obviously wins. The cheap one is genuinely good.
Shun Classic 8"
Beautiful, precise and the one I'd want to use every day. This is a place where the nicer object can genuinely make cooking more enjoyable.
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Victorinox Fibrox 8"
Not precious. Not flashy. It just cuts extremely well for the money. If the Shun price makes you hesitate, buy this and move on.
CHECK AMAZONWho I'd tell to buy which one
Buy the Shun if you cook most nights, care about the objects you use and want one excellent everyday knife rather than a drawer full of mediocre ones.
Buy the Victorinox if you're starting a kitchen, buying for a college apartment, don't baby your equipment, or simply cannot imagine why a chef's knife should cost that much. I would rather see someone own the Victorinox and a good thermometer than blow the whole budget on a fancy knife.
The one I'd buy
Shun if I am buying for myself. Victorinox if I am optimizing purely for value.
And whichever one you choose: don't immediately go buy a knife set. Use this one for a while. You'll figure out what second knife you actually need — if you need one at all.