The Mora knives are nice. Swedish army issues the Morakniv 2000. They are sharp as hell and can be resharpened easily. But they can also break if you abuse it. I once saw a semi-retarded guy trying to remove a muzzle brake with it. It broke, and he cut himself in the other hand or similar.
I like the Finnish army's special forces knife called Sissipuukko M95 (and the smaller version M07).
The M95 can be used to take down a decent tree (if you for some reason would like that). But they are pretty lightweight for their ruggedness, and a lot higher quality than the Mora knives - which could be expected when they cost like 3 times more. I like mine. Sharp and stable. Feels like a "field knife".