I don't know to be honest with you.
I only own two fixed bladed knives that I have used to process a big game animal. In both cases, I have never used them for anything else. I take them out for a hunt. If I use them, I come home and sharpen them and put them away until next season. It kept it's edge good enough to process one deer. Beyond that, I don't know.
I always judge a folding knife's ability to hold an edge by how long I can carry it on a daily basis and have it remain sharp to my standards. I use the folders all the time, mainly for stuff like opening the mail and packages, but a lot of other stuff also. With the fixed blades, I basically only use them for one task and then sharpen them in preparation for the next hunting season, so they don't get any kind of long term evaluation.