I've just returned from a MSP-SEA-KIX/NRT-MSP trip. Both segments had the new WBC (DC-10 to KIX, 747-200z back to MSP).
Yes, the seats are much better in terms of the recline, and so is the leg room, but if you are used to flying in the upper deck on the 747 as I am, there is really no notable improvement. The DC-10 I was on to KIX clearly had a hasty conversion, as a lot of the overhead panels had either loose or poorly-matching parting lines.
As far as I can see, there has been no change in the food quality. It's not bad, but there is nothing to make a big deal out of it.
I am not saying that the new WBC is not good. If you have flown the WBC before, then you will appreciate the space that the new WBC for the same fare. I just don't see a big difference beyond that.