PS4 is the overall leader, has the bigger LTD.
830k for november is fine, less them 1 million in december is not.
Yes, it has the higher lifetime sales. I don't know why you're telling me things I'm aware of. Unless you're talking about the impact of network effects I don't really know how that's relevant to whether being over or under a million in a second December tracking period is some sort of benchmark and/or pertinent to current sales rate market share for the core segment.
They're selling to the same audience. The increase in sales for the Xbox One has at least in part come at the expense of the PS4.
We didn't have two systems doing over a million in December selling to the core segment until 2009 last gen, with weaker Novembers.
Then you have later cycle sales numbers, where the target market for the systems has expanded more mainstream.