Are they on par with Xenons or better?
I can't comment on what the LED headlights on the mk7.5 Golf are like. However, my Polo GTI has LED headlights and I find them very good.
I previously had a mk6 Golf GTD with xenons, and although the LED's on my car are probably not as technically advanced as those fitted to the latest performance Golfs, I'd say they are at least on a par with my previous xenons. The light is whiter, which IMO improves illumination and night vision.
Assuming LED technology has moved on from when the LED headlights were designed for the Polo, that suggests the LED headlamps fitted to the mk7.5 Golf should be good.