http://blog.planet5d.com/2012/12/the-hi ... -mark-iii/
The link gets to a site where an astrophotographer compared the Canon 6D directly with the 5DMkIII and 5DMkII for digital noise at higher ISO settings. The test results are very interesting.
My interest is night, low light, star and Aurora photos. As such the 6D looks as if it will be very good for that use. Anyone know of a direct comparison at 10-30 seconds with the Nikon D600?
If I can get a bit cleaner images with either of the Nikons I would buy it over the Canon for this use. If they are equal I will stay with the Canon. Again, the use I am looking at is very low light, longer exposures.(up to 2-15 minutes even at times with lower ISO settings)