Yes, when I first saw the thread I thought you may have been referring to MK2, those do have xenons.
LED headlights are better and brighter than halogens (but perhaps not in foggy or very rainy conditions)
Are they better (brighter, longer reach) than the xenons, this is debatable.
Are all LED headlights created equal?
I would say probably not, Prius and Mercs LED headlights seem to be much brighter and intense than the Leon's (pre FL) when side by side at the lights.
What I can say though, is comparing high beams, the LEon's LED are way better and brighter than
Ibiza Bi-Xenon's high beam. On dipped beam, I can see not a difference, just Leon is slightly more blueish.
So yes, do wait around for a TechPack equipted Leon, LED lights all round (just not signals and reverse light), Sat Nav and DAB radio + CD player & 2nd SD card slot in glove box, and possibly USB connectivity (either in glovebox or under AC controls).