Since you're using the term 'best'...

Best UI

Have you seen the PS4 UI? No. You're just assuming it's the best because the conference put so much emphasis on it. Might as well assume PS4 has better games since the emphasis was on that.

Xbox One's UI can be controlled by voice, motion, or controller.  It can instantly switch from your television to any game you have installed and back again without the need of getting off your couch or even picking up a remote.  It has a snap function to bring up windows to do searches with voice commands.  It has Skype conferencing.  You're dreaming if you think Sony will come close to matching this, it'll take them years to copy the things the PS4 would even be capable of doing.

best online infrastructure

Cross game chat was the only 'trump card' on 360. That's gone now. There is complete parity between the two services. Oh wait, PSN is free.

I'm not talking about cross game chat although Microsoft has upped things again in that department, I'm talking about 300,000 servers.  Ask someone at Sony if PSN has as many servers and I'm sure you'll get some BS PR response that if you read through the lines tells you they don't.

best next generation racing sim

Very, very debatable. Whilst Turn 10 have made giant leaps with the Forza franchise, I would say that 'best' so unequivocally is taking it a bit far.

I guess we'll have to wait to see what racing sim Sony has for PS4 but until they announce it and we have it in our hands Forza 5 will be the undisputed champion of racing sims for next generation consoles.

best first party FPS

Most recognized and popular - totally. Best, also debatable. (less than the above though)

Metacritic
Killzone - 59
Killzone 2 - 91
Killzone 3 - 84

Halo - 97
Halo 2 - 95
Halo 3 - 94
Halo 4 - 87

You call this debatable?

best skeletal/muscle tracking

Yup. They sure have this one.

best voice recognition

It's just software. Anyone could implement it. No-one has really cared much for this.

So you agree it has the best voice recognition.

best controller

Firstly, none of us have played with either of the next-gen offerings. Whatever the result, they will be very, very close.

The rumble in the triggers has been called "freaking awesome", I have yet to see anyone describe the PS4 controller in such a way.  I guess we'll have to wait but it's looking very good for the Xbox One controller.

best video conferencing for gamers

Can't believe you all care for skype so much.

best scaling for games (Xbox One is the only console that supports 4K for both games and video)

LOL WUT. Your credibility is gone. Completely.

How is my credibility gone?  It is the only console that supports 4K for both (PS4 only supports it for video), if you don't believe me go look it up.

best audio chip

WUT.

Same as above.

best support for the top 2 third party franchises (COD and FIFA)

Are you really happy MS spends money on timed exclusive DLC and not on new games? Ok then. And Fifa... wut?

Umm you haven't heard of the deal between EA and Microsoft?

best with interacting with all your other electronic devices

'best' cause this is their whole angle.

Since you're using the term 'best'...

best audio chip

WUT.

You 'ONE' ok.

You just conclusively proved it's the best console and therefore the shit-tons of iternet rage, youtube videos and forums swamped with negativity are simply Sony fanboys trying to get one over on the 'ol enemy.