In the last generation there was really no discernable difference between the consoles, unless you were desperate for a bluray player, or vastly preferred the exclusives. Combined with the fact they were released at different times would vastly offset the direct competition and comparison between the consoles.
You can release a worse console earlier, and get your market share that way. Msoft seem insistent on releasing a worse, more expensive console at the same time.
The killer blow “"PS4 will not impose any new restrictions on your use of PS4 game discs," said Jack Tretton, boss of Sony Computer Entertainment America.”
I, for one, welcome our new Japanese gaming overlords