I have an old Chicago Cutlery 8" fillet knife.  It has a wider blade than most traditional fillet knives but still fairly flexible.  It also does not have much curve to the blade.  It has a wood handle which is not as slick as plastic when wet.  
I try and keep it sharp enough to shave the hair off the arm.  Best way to keep it that sharp..., keep it away from Mrs. fishinbuddy, she never steels the knives when she is done.
Good carbon steel, sharpens well and holds an edge and only needs to be touched up with a fine steel after each use.  
I used to work in a restuarant and have tried all sorts, never found one I like as well.  

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BrownTrout!

11 feet? Wow!!! I wanna catch fish with you! 

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Ooops.

Why yes, it doubles as a tarp pole and also a club before we boat the northerns!   

I also use a Gerber fillet knife.  Mine is only 11" long, though, with a 6" blade.  It has a rubber-coated handle (or some synthetic version of rubber) so it's easy to keep a firm grasp on.  I like how well it holds a sharp edge for a long time with just a bit of touchup needed during the trip.

I did look at the 11' model, but elected not to get it because it would be such a pain to portage.  Would have made a nice bear-sticker in a pinch, I suppose.

im with the beaver.   old reliable 6" rapala with a small stone along.

Rapala fillet knife.  6" blade.  Wouldn't leave home without it.

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I have this same type of sharpening stone, which came with the knife - also Rapala brand. Its been a while, but I think I ruined the edge on my last knife with a similar stone. Now that my newer knife is showing wear, I'm sort of reluctant to run the knife through it. Any tips?

-YB

The ceramic Vs, I think, will maintain a good edge - much like a steel. Neither sharpens but the Vs in plastic work better for trips. I have one with two Vs, one corse one fine. The course works in a pinch if you abuse it but you'll need to bring the bevel back by other means.

Set the important part of any blade on your thumbnail, when it digs in, it's sharp enough. Once it sort-of catches, the Vs or a steel can bring back a decent edge. If it just slides right off, it needs to be sharpened.

I know a guy who would fillet a hundred fish a day at various sport shows to sell his videos. To hear him tell it, and I believe it, a ballpoint pen is plenty sharp enough when you know what you're doing.

Mine is a a little stiff for my liking but it folds.

i've been waiting for a chance to tell this story!!
it's a little off topic but it's damn funny !!
db's comment about checking the sharpness  of a knife using your thumbnail was the way my late dad taught me. he was a machine repair man and a old farm boy. to him a knife was either sharp or it was worthless!! sharp being shaving sharp!!
years back i used to backpack with 3 other guy's. we were on Isle Royal for are 1st of 3 trips there.
my friends were the type that brought as little as possible because they knew I would have what i needed!!
anyway we all carried freeze dried in those day's and the early bags could be hard to open so i was easier to use a knife to slit the top pryor to rehydrating.
i had a folding hunter type that my dad had put a edge on.
my friend as usual didn't have a knife, so he asked" Anyone have a sharp knife??". i replied i did and tossed it to him, and went back to fixing my meal.
Suddenly, i hear a scream, a bunch of cursing and i look over to see my friend holding his thumb and blood squirting everywere!!!
i went to see what happen and he start's yelling that it's my fault he cut himself??
perplexed, i asked  him how he figured that??
i said i told you it was sharp!!
he replied" not THAT sharp!!!
turned out, to test it's SHARPNESS, he took his thumb and ran it down the blade!!!
cut it to the bone!!!
we manages to get it bandaged up(my first-aid kit) and we finished the trip.
for 6 day's i had to listen to him whining about the SHARP knife!!!
to this day he brings that up !!
i told my dad about it when i got home, he just shook his head and in that old school farm boy way said" what part of sharp, didn't he understand" !!!

LOVE my Wustoff fillet knife.  I think it has about a 9 1/2 inch blade.  Still bring a Rapala too for backup.

I use a folding Buck fillet knife. The blade locks in place when open. It's great for packing and safer than a fix blade. I believe it has a 10'' blade. They discontinued the 10' blade .