I've owned a few Grohmann's, and still own a #2 Bird and Trout knife.
My brother has found a way to liberate me of my #4 Survival and #3 Boat knives

Despite my best efforts to get the #4 back, he has so far resisted the temptations
that I've put before him
They are good knives to use. I had issues with the #3 Boat knife with the
way the handle was laid out in relation to the blade, but my brother loves it
that way, and the #3 is one of his favorite knives.
The #2 Bird and Trout knife sits in the kitchen knife block and gets used all the
time for kitchen prep duties. It's stainless, so there aren't many issues with
it for food prep.
The #4 is a fair bit heavier, and would make a pretty good outdoor knife for
all round camp chores. I think that it's a little bit too light for chopping, but
it works fine for batoning through wood. I've used it that way, and my brother
has also. For a larger outdoor knife, I would prefer something a little bit heavier
though.
I haven't had the opportunity to get a Grohmann #1 knife yet, but hope to do so
in the future. If I do, it will be in carbon, not stainless steel. Grohmann's Stainless is
ok, but I've noticed with the #2 that it gets dull quickly.
Putting an edge on any of the Grohmann knives that I've had was pretty easy.
I always carry a DMT Diafold Diamond file, and have used that to sharpen with no issues.
Cheers