Paid trips aside, I took only one award trip on LH metal last year in Y, LAX-FRA-JNB.
Although, LH states they NEVER upgrade on award tickets, as a Senator, I was upgraded LAX-FRA and JNB-FRA. For my ex-FRA flights, the lounge fraus grimaced at my questioning an upgrade.
I was worried about actually sitting in Y for back to back long hauls and my upgrade angels were looking out for me!