Now you've mentioned that Marc, I've looked a bit more closely at the texture.
I'd put it not looking as deeply textured as Glacier down to being a photographic fartiact, but now I'm wondering if it might actually be something else.
Glacier glasses feel sharp to hold, they're not comfortable and they don't fit into my hand nicely. They're not well designed ergonomically, as far as I'm concerned.
Maybe they fit very large hands, I don't know.
I no longer have any Glaciers in my possession to do a comparison, but I do seem to remember they have quite deep, long vertical chunks in them.