Cohoangler and GutZ:
The technique I described is not just for big kings. I have filleted everything from 6-7# pinks to 60-70# kings using this method.
Funny you thought the knife in the pic was on the small side... I felt it was a little too big. My preference is a 6" Rapala like Dogfish posted on the fillet knife thread.
This technique can be used either before or after gutting a fish... just depends on when the fish makes it to my hands. The main thing is that the fish has been thoroughly bled. This technique cuts across dozens of blood vessels close to the backbone.... makes a real mess if the fish hasn't been well-bled beforehand.
Here's another pic of a less-than-stellar fillet job. Made the mistake of covering my working surface with a slippery plastic sheet (never again) in a misguided attempt to keep it clean. Lost a little meat on account of some slippage. Anyway you get the idea of the finished product on another non-gutted hen. BTW, my favorite part of a king is the inch-thick belly slab and those collars, especially right where the fins insert.... MMM MMM!
FYI, the belly slab in my left hand weighed nearly 9 pounds!
BEFORE:
AFTER: 
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"Let every angler who loves to fish think what it would mean to him to find the fish were gone." (Zane Grey)
"If you don't kill them, they will spawn." (Carcassman)
The Keen Eye MDLong Live the Kings!