On the FlyZed website I see the flight listed with a yellow smiley face. Thats as good as I can get with loads on LH. I would go for it its a 747= lots of seats = lots of no-shows.
They show only 3 levels red, yellow, green. I've no idea what % of seats these colors indicate.
They do not put you to 1st as a practice, but the gate agent may do it. Smile!
Tschuess