Looks like you're getting a lot of different types of replies, are you wanting a "one knife" to work for both field dressing and processing of the meat? And do you want that knife to serve its purpose on small to large animals, including birds and fish? And you want it to be right for "you"?
Well GOOD LUCK ! . . . . I primarily hunt large game and even then I carry multiple blades in my pack to field dress my kill (which sometimes includes quartering and maybe even boning). When I get that animal home, I usually use yet another set of knives to process the meat. If I was hunting small game, birds, or fishing, I might even have a different set in my pack. Not to forget that my brother (my hunting partner) uses a set completely different because he likes a different feel and has a different sized hand.
The cool thing is that knives are relatively inexpensive (so you can own a lot) and can be found at numerous retail stores (so you can get your hands on them before buying). . . Don't get stuck on "one". Sure, one will work for all that you are asking of it, but probably won't work well on any of it.
Too many people get stuck on what the blade is made out of, how sharp you can get it, and how long it will hold an edge. It's all hogwash. . . . . My favorite knife is a plain 'ol low carbon steel blade. I will say, it is definitely much easier to use a sharp knife, but it doesn't have to be "cut paper" or "shave hair" sharp to serve it's purpose. If you get one with a blade that will hold an edge a very long time, keep in mind that it will probably be hard to put that edge back on, which is fine at home but not what you want in the field.
