I know people loved comparing the BF4stats user count, but BF4db shows number of players and peak players (24h). The X1 is less than a million players, lower than any platform. PS4 is 3rd below PS3 and PC. I know the X1 has sold less, but I didn't expect it to not even break a million players since Second Assault was timed exclusive.
Obviously the peak players in 24 hours will fluctuate depending on when you look at it in the week
Also, PC has a ridiculous amount of servers, but rent-a-server just launched for PS4