I flew Qatar Biz from Singapore to London in December last year, my first flight with Qatar.
I agree with the comments on the food, and I especially appreciated the ability to tell the staff when you want to eat, which is a huge advantage in resetting your body clock during long-haul flights. Service was excellent and I would have no hesitation flying with them again.
But am I the only one who was less than impressed with the dearth of wine choices? From what I recall, I had a choice of Lanson Black Label NV and Rose, a Chablis and a New World white (can't remember which, unfortunately), a 2012 Bordeaux, a Tokaji and a Port. I recall flying Qantas Biz a few years back, and being offered quite a few more selections than that. The current Qantas website, however, seems to indicate that it is basically down to two choices per wine category much like Qatar, so maybe that's the way all Biz is heading...