Thanks for all the comments. Much appreciated.
I know the whites look very white, but I think that's because they are just, well, white. I've checked LR and they aren't blown - they are only just touching the clipping point in one or two very small spots. I do agree towards the top of the falls they look a bit like they are though.
I do like Kodiak's darker rendition, but I didn't want to darken mine too much, but probably could have gone a bit farther, maybe a bit between the two, as was said.
Interesting one about the WB. I did cool it down a bit from the original. Too much? Or not far enough?