To me it is rather obvious, that they've done the upclock already, before reveal, with a sole puropse to "killshot" 10tf Sony machine. 12tf is more than anyone expected within sensible budget.
I don't think MS did much of an upclock. High end (2080Ti) is at 13.5TF for a 2018 product. 12TF is the least i 'want', because the generation is going to be another 7+ years. The faster CPU, higher BW where already in place, as was the bigger SSD drive. The SSD speed of xsx, according to rumors will be rather competitive.