Actually, John, I have a little different take on this. I looked at all three versions for quite a while, and kept being drawn back to the original. I like the way the tree tops on both sides slope down to the lower third of the picture. It helps to guide the eye toward the rock. If you crop out left or right, you lose that. I like the feeling you get when you follow those treetop lines to the rock . . . kind of like that mountain is a surprise (like walking through a valley and having "shangri-la" suddenly appear before you.)
I also agree with Anthony that you need a little more drama --I would play withe the tone curve to put in a little more contrast without blowing out the highlights.
You can see how many different opinions (and "photographer eyes") there are. In the end, it's what YOU want and what vision you want to express.
Great shot, in any case, John!
Best Regards