Personal experience: I have many, many knives. The knives I own include a tactical Remington tanto blade, a fillet knife, for fish. I own a generic knife that I bought at Wal-Mart.
The Remington is probably the best knife I have ever used. I say this because it is so easy to sharpen, you could be a caveman using a rock and still hone it to a paperthin edge. Never use this knife for throwing, as it is unbalanced and will only damage the handle.
The fillet knife, also known as the killfish, is the sharpest blade I have ever had the misfourtune to be grazed by. The kitchen drawer got stuck one day, so, being the handyman of the house, I unstuck it using WD-40.
The killfish caught on the edge of the counter. So, the killfish flew out of the drawer using the converted potential energy, and cut the top of my hand so bad that my aunt, who is a nurse, recommended that I go to the ER. I never did, and the scar is still there to this very day. The killfish is most useful to clean crappies and other North-eastern fish.
The generic, Wal-Mart knife is the most fun knife that I have. It is a throwing knife as well as a a tactical knife. It doubles as a box-cutter. You can't sharpen it safely, as the shavings are easy to inhale.(Believe me, you don't want razor shavings in your traechia)
Those are my knives.