I'm interested that you mention NZ. I find the J seat to be quite confinding. Not to the same extent as the (old) CX "coffin" seats, but for me (I am not a big guy - yay diet - but I do have long legs and a decent frame) the NZ seat in bed mode is not adequate for me (my feet wind up outside the footwell half the time ) and even sitting in the seat I find it less than ideal. While I have not slept in the Business Suite, I have reclined it fully flat and had a lie down to compare, and I found it much more comfy for me - mostly for the leg room aspect and I also felt the time I did it, being in 4A which had the seat towards the window it felt extra cosy and private compared to NZ where you are, more or less, facing the aisle.
I also feel the seat area storage space (ie: the shelf area) to be superior in the QF product)
That's just a personal view though but having done a number of long hauls in NZ J on the 77W and 789 I'd take the QF hard product anyday. NZ catering though.. I'd keep that
I guess a case of you can't please all the people all the time