What do you mean by "competitive"?
Looking the USA numbers where the price relation and sales are well know the sales delta is less than 20%.
If we count the March NPD with the TF bundle, which is arguable $60 price cut, the difference was 15%.
So, just matching the prices would be enouth to bump XOne sales by a large margin, $150 price drop would be insane, I don´t even think Microsoft would have enougth supply for the hollydays quarter.