...I think the up-sloping vegetation at the left is a terminating detail that significantly improves the composition, and the start of the mountains gives depth to the picture that's lost when it's cropped out. I also think the vegetation in the center keeps your eye from falling off the edge of the plateau...
Still leaning towards Christian's crop, but in retrospect I have a firmer grasp of why. The original crop left off a bit of the foreground near the middle, making the bottom of the frame resemble a funnel. I think that funnel effect is drawing my eyes off of the frame at the point where the foreground drops below the print edge.. Perhaps that is where I feeling a bit of visual discomfort.
Had there been a bit more of that middle foreground (or cropped up as Christian had done) then I think it would be a stronger composition. Christian is correct, though. There is not much that can really be done aside from what he has already shown.
That said, again, I like the image and think it's pretty effective. I just think it could have been even more effective with a better attended foreground.