16mm performance ?

I`ve searched but can`t find anything conclusive about how good the 16mm is , any thoughts on its performance both wideopen and stopped down a bit ? .. any full size samples wideopen (preferably at 20Mp) to show edge performance etc ? . Thinking of it to compact the NX200 , there`s plenty of cropping space.

Thanks

--
** A Problem is only the pessimistic way of looking at a challenge **