Biggest game on console is still call of duty in North America.
Call of duty: Ghost on PS4 sold 1.46 million vs X1 sold 1.53 in NA.
This year Call of duty: Advance warfare on X1 sold 1.78 vs PS4 sold 1.47.
The North American market will be very close for these two consoles. But, the trend has started and X1 has shown the potential to take over this market.