+1.......have used this same knife for over 35 years....I'm only a wanabe knife guy, but the 4 and 6" version of this has put many hundreds of pounds of fish in my freezers. Give or take 40# of fillets this year.
I have a 20+ year background in meat-cutting & suggest a Forschner. Link:Victorinox 40711 Semi-Flex 8" Blade Fillet Knife Fibrox Handle 40711 | Victorinox Cutlery - Wasserstrom Restaurant Supply
If price is an issue & you just wanted a good quality basic knife, then Dexter is a good option... Dexter Russell Basic Fillet Knives | TackleDirect