In QlikView we can’t connect directly to SSAS like in PowerPivot. We need to create a OLE DB linked server first, then use OpenQuery. So the output is flattened rowsets. In PowerPivot we can specify MDX statement and get cellsets e.g. they have axis. For differences between flattened rowsets and cellsets, see this Brian Welcker’s post.
PS. For normal Excel table or pivot table (not PowerPivot) we can specify MDX query by editing the .odc file, see Chris Webb’s post here.