Yup, took the Mkiii to the night safari on the very first day it was launched. Was amazed by it's low light capabilities. I still get OOF shots esp with moving animals but compared to my Mkii, I would say it's a marked improvement.
All taken with 5DMkiii + 70-200 f2.8 IS Mkii ISO from 10000 to 51200.
5DMkiii Test Shots - a set on Flickr
nice shots. I'm waiting for this sat to test out Night Safari.
Going to use the same setup as you so I hope I get good results! Any tips on what AF settings I should use?