My pre-FL (2013 model) one even had headlight washers (but no winter pack). I thought they were quite good, brightness wise. Wonder if this was the brighter variant that required the washers (as per regulations).
Now got a car with D1s Bi-Xenons. I would say this is on par with the LEDs on dipped beam (after tinkering with them to raise them a bit). Nobody has flashed me though.
And yes, if you pull the high beam stalk towards you, on the pre-FL they just turn on 6 additional LEDs, (eg..for flashing). But if you push the stalk away from you, the 12 dipped beam LEDs, also rise. Had no high beam assist though.
Me personally, the Leon LED high beam with the dipped beam raised is the best high beam I've used. Of course I'm comparing this to halogen and D1s xenons only. Haven't driven any other LED headlights cars. However when I see a Prius with the dual LED headlights, I'm always impressed at their brightness, or the Merc E class dual LED.
D1s Bi-xenon high beam is very poor compared to the Leon's Pre-FL high beam in my experience.