Natural coffees can be funky, as can Sumatras. So one might expect a naturally-processed Sumatra to be particuarly funky. It might be, but the one I have from PT's is remarkably clean.
Source: http://www.roaste.com/CoffeeBlogs/fincawhd/PTs-Natural-Sumatra
Source: http://www.toastedfoot.com/2012/10/cigar-contest-honey-hand-grenades/