I have both old, 25 years plus, and new, 6 months, Old Hickory knives. The wood on the old ones is fantastic stuff. The new ones is pretty awful. No idea what it is though.
I took steel wool to the new ones. As fine as I could go. Really smoothed them out. Then warmed the wood by placing in the oven at 125F for half an hour. Brushed them with vinegar, this made the grain stand out. Polished the wood with 2,000 grit automotive paper. No this didn't make them overly slick.
I then treated then with the left overs of a rifle stock refinishing kit I had. (most likely tung oil) They look a lot better for sure and are holding up well so far.