Each are pretty unlike anything else I've heard (and, by extension, quite different from each other). The reason I made the statement is really because both MBV and Sigur Ros are great artists - you would be doing yourself a favor to check into them. I don't know whether that would be true with Amusement Parks on Fire.
I've always been meaning to check out Sigur Ros, I'm just a procrastinator. However, I never heard of MBV until now; I will be checking them out...I'm still procrastinating on Amusment Parks though...