Although not many in this forum are fluent in Italian ??? this is the link to the test of the Korg MR-1000 by the Italian HiFi magazine AudioReview. There are some interesting graphs which are understandable anyway. It appears the main limit of this excellent recorder is the noise figure.
I thought this would be of interest
http://www.audioreview.it/files/primo_piano/AR276-KORG.pdf
As a few of the spectrum graphs seem to indicate, MR-1000 noise 10-100 cycles seems way too high at -73 dBu