I have browsed <http://www.wikimatrix.org/compare/ikiwiki+MediaWiki>, but I am still not sure about which useful features (if any) I would miss from MediaWiki...
So the best way is to actually trying it, isn't it?
+
+I would also try to integrate Ikiwiki with [Infinote](http://infinote.org/), in order to do concurrent editing of pages.