I'm happy the HD Twins are doing well as it shows the market for core gaming is still healthy as long as you reasonably budget your games and don't ass fuck your customers like Forza/NBA2K14/GT6 are doing.
Otoh, it's a bit odd that Xbone is doing as well as it is. Just shows how bad Sony fucked up their company's position in the USA over the last 7 years. Normally two systems with generally equal software, where one is $100 more and is weaker with worse 3rd party games would sell far less systems than the other system. But Xbox brand is very strong in the US (people just refer to videogames as = xbox for instance, like they used to call all videogames "nintendo" decades ago) and Playstation brand has fallen a lot so in the end they'll be neck and neck. Personally I think a lot of this coincides with the death of Japanese game taste in the USA, and companies that go for a more global audience are having a hard time competing with dudebro MS image of CoD/Madden bros. Plus whenever Sony attempts to copy Nintendo or MS they fall hard like Playstation Allstars and Killzone. Sony's just best at sticking to their original titles, but those original titles like Puppeteer or Sly Cooper, SoTC, or Siren, Gravity Daze, or Beyond don't have any USA appeal at all. Their only brand with USA appeal is God of War (killing things violently), Uncharted (shooting things violently) and used to be Gran Turismo (doing things boringly), but the latter's dead at this point.
If XB was the same price as PS4, it'd be non-surprising to see it selling as well, even with weaker hardware/3rd party because at the end of the day 95% of people buying a system don't care about system power as shown by the Wii, but you'd think $100 difference would've made a huge difference in sales between the two just on the principal of $100 is $100. Then again, I think a lot of Xbone sales are because PS4 doesn't exist anywhere and it's either Xbone or no new system for you this xmas. Sony should've done a better job with supply.