Interesting thread, might as well throw my two bits worth in...
Of late my favorites are by Knives of Alaska a folding knife called a Denali Master Guide and a fixed blade called an Elk Hunter. These knives have a handle shape that fits my hand very well and the D2 steel seems to hold an edge very well.
http://www.knivesofalaska.com/catalog/prod_display.aspx?from=Folding+Knives&cat=Denalihttp://www.knivesofalaska.com/catal...ixed+Blade+Knives&cat=Trekker+SeriesFWIW last year working with my partner we gutted, skinned, and quartered an elk and a moose, knife was still good to go although I think I touched it up before I went deer hunting. I guess that is only one full critter because we were working together.
The other thing I do is the knives I use for cutting critters up do not come out for anything else. I have a camp knife that I'll cut a weiner stick with or whatever. I think this contributes to the knives staying sharp.
I keep these sharp with an edgepro. I have determined I was too useless to do what I considered a satisfactory job by hand so I bought one. I feel these are a worthy investment because they enable the application of a very consistent angle on the edge of your knife. The end result, for me, are knives that are sharper than any I've had before and they seem to stay sharp longer.
Not sure of the hardness of these knives but it seems about right. I have an old Buck that I bought about 40 years ago. I find it a little on the hard side as it is the devil itself to sharpen, holds the edge once it's there though.