Thanks for the comments folks. I had another look at the lion and elephant shots and the colour temperature on all of them was about 4600 which is too cool. I increased all of them to around 5000 and I agree they do look better.
Thank heavens for shooting RAW.
It was a fairly hazy day when we were there and I was shooting with auto white balance so perhaps the blueish haze upset the camera a bit.
The lion was a tough one in deep shade under a tree.
Resharpened the Tsessebe to give the coat a smoother look - I agree that it was a bit overdone.
Dave, I did have a CPL on the front for the whole day, maybe I need a lesson in how to use it
Short of cloning out that whole animal in the background there isn't a lot that can be done about the ear in the groin
Andre, I quite like the 50-500 although it is much better when you only go to 450 - tends to get a bit soft at the long end. I tried to use a monopod on the safari but if I was to go again I would probably just use a wheat bag or similar to steady it.
I am wanting to move it on if you want one

as it isn't a lens that I think I will get much use out of long term and would rather put the money into something else like an AF-S 28-70.
Again thanks for the comments, I learn so much having others critic these things.