There most certainly is a difference. The reason why you didn't notice it, must be because when the first two ps4 software updates came out (a few wks ago), you didn't delete & then reinstall the nhl15 disk again. Mickey you mentioned then that you noticed a difference. Most people didn't reinstall the game when that happened. That's why those people didn't notice a difference, because then it would be the same.No worrys.