The guys I've talked with who carried the Western G46-8 in WWII/Korea have said the knife was awkward to carry, the blade was too long for anything but stabbing people, and the handle would sometimes break if you slammed the pommel down on someone's head. I suppose that is why we see so many of them in nice condition: they didn't get much use.
The factory would repair these (until sometime in the '70s I think). The factory guys I've talked with have said that there seem to have been a higher percentage of problems with the pommel attachment breaking, and with broken washers, than with the late G46-6 with a similar washer-style pommel.
The post-war design changes seem to have solved everything but the awkwardness of carry, and changes in web gear may have addressed that. I think I've seen more of the later knives with a history of use during the Viet Nam war than WWII knives carried in WWII/Korea.
I've got one of the WWII knives with the typical cracked washers. One of these days I'll probably get around to fixing or replacing the handle.