My knife is a sabatier for £6 out Asda. It cuts better than any other knife I've used. Personally never seen what expensive knives offer
Generally the quality of steel, weight and overall weight distribution.
Quality of steel probably won't matter as much if you are just using it for your dinner, but if you are a chef and cutting all day, the quality of steel will matter. (but that doesnt always mean that cheaper knives don't have good quaility steel!)
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