No they are not real sharp. Like you said more of a pry bar to open them up but enough of an edge to cut/scrape the muscle from the shell.
That being said I have seen a few people slip and put one through their hand!
Nice Oyster Knife there Nowicki
A "trick" for your Dad (he may know already),and any Oyster shuckers.
I used to be a restaraunt cook and Chef,for years.Out on the Esat End of LI NY,it is all about seafood....
Anyhow,as you insert the Oyster knife,into the shell....
Right handers :
the oyster in the left hand,with the outward natural arc of the oyster shell facing out,this is the best spot to enter
With the Oyster knife in the right hand,"choke up" on the blade,and place your thumb,atop the flat of the blade,like 1/4" from the tip,this way,if the shell crumbles,or you slip,your thumb will act as a "stop",only the 1/4" of the blade will be driven,if you slip
The Oster shells with the "air bubble" holes in the shell,will almost always give you breakage trouble
I'd love to have a matched set,Oyster and clam knife,It would go good with my Chef set of customs,that I just about am finished taking delivery of the last one,the 8" Chef.
My avatar is a Tom Krein 8" Chef,I am patiently waiting for this one !
-Vince