I got no experience in the Swiss bayonet but well of the Swedish. I bought one in a army surplus store and it was in perfect condition.
It's extremely sharp, not so thick but surprisingly sturdy and strong. The Swedish bayonet also has a hollow handle and a "rifle mount" (?) so you can place it on any Colt (M16s etc.), Heckler & Koch (G3 series) and so forth. The blade is, if I remember correctly, 20½ centimeters long (ca 8,2 inches). The handle looks really bad, at least it doesn't appeal to me, because of the "rifle mount" on the upper side, however there is a solution to that as well.
My father, an experienced warrior from the "good ol' days" (1970-1990) and an active partisipant of many wars, bought a Swedish bayonet and got the handle (everything but the blade) removed and and switched to a wooden one, the same shape as on the Ka-Bar knives (roundened), and after some treatment, it's extremely sharp. Sharpest knife I ever seen. And he used it during several wars, he used it actively I might add, and it doesn't even show. The blade is still in as-new condition, but the handle had to be, hm, polished a couple years back. This knife/bayonet is EXCELLENT for a fighting knife - for the serious person who isn't looking for something fancy, but dead-on effective.