Thought I would jump in. Full disclosure I work for Industrial Revolution, and we are the U.S. Distributor for Mora. Most folks don't actually buy directly through us as we are the importer, and sell to other distributors and retailers, but we get to see and use most every kind of Mora that comes into the country, so it's a fun job.
Back to Mora knives: even the small, lighter ones, like our fireknife (with Swedish Firesteel in the handle) are fine for batoning. Bigger knives like the Bushcraft and the Robust are more survival than anything. I have seen people cut down trees up to 8" in diameter with one.
These knives aren't what I would call ultralight (fireknife is 3.4oz incl. firesteel) but they are super functional. As far as an "ultralight" fixed blade from Mora, I like the Eric Frost 120. It is roughly 2 oz., full sized handle, laminated steel blade (wickedly sharp, designed for woodcarving) and a true pleasure to use. Again, not as light as something like the Baledeo, but I don't know of a better knife for the $/oz.
Just my 2 cents, sorry for jumping in!