On my screen there is virtually no difference although the origianl seems to have very slightly more contrast which I prefer, but, really it's an academic difference to me. The edited version has some slight cloud detail which is nice,...but not worth all the HDR hassle surely?
It certainly does a good job of retrieving detail in the sky though it also seems to have added a cooler overall look. I think I'm with jebuskrust though. With a RAW file you could probably retrieve the sky just as well in LR.