We saw the big 5 within the first 24 hours, the game drives were amazing and it is part of the fun not knowing what you are going to find. I was a little despondent the first morning we were there as we were driving for an hour and not having seen anything and then suddenly we came across lions mating!! Apparently this only happens 5-7 days every 2 years (obviously more frequently with other lionesses) so this was pretty exciting.
The jeeps don't take you so close to the animals that it warrants the 24-105, mind you we had a rhino almost shoulder barge the jeep so that would have been a good use of the lens
The very last day I pulled out my 14-70 as I had this on me and took some photos of the people in the jeep and the animals..that was kind of cool
As for the weather, it gets quite nippy on the jeeps and we wore 3 jumpers, gloves and hats, you want to layer as much as possible and then just peel off if you want. Its pretty much like a spring day here, cold in the morning and cold in the evening.
For some reason the 1.4x converter was never used, I am not sure why tbh. Also a word of advice is to shoot in TV mode, I was just looking through some of my photos (taken in Av) and they are not sharp