Good one according to which criteria?

Mine. (This is tautological.) Anything else that is kind of similar to mine would be acceptable.

CEV<humankind> is perfect according to humankind's criteria if humankind were more intelligent and more sane than it currently is.

Which is fine if 'sane' is defined as 'more like what I would consider 'sane'. But that's because sane has all sorts of loaded connotations with respect to actual preferences - and "humanity's" may very well not qualify as not-insane.