5Dc vs 5D mkIII: starry sky comparison?

For who owns both cameras can u post a comparison 5Dc vs 5DIII native fine jpegs (neutral picture style, no incamera NR) on starry sky: use wideangle lens, stop it down at f2.8-f4 and 10-15-20s exp. under a low (suburban-rural) lightpolluted sky, try 3200 and 6400iso?
For correct exp look at incamera histogram, curve must be at 3/4 left.
Thanks