Many fortunated e3 visitors played in first hand both in xb1 and ps4, but what units were that?
Ps4 had some true lags, in Assassins Creed 4, the dev in the live play ($ony preconference) shaked himself when it lagged...
It looks like $ony almost finshed ps4, M$ only had the box, not the hardware... They dont even have the hardware finished, in e3 when a xb1 crashed it got in an windows 7 HP screen, when a ps4 crashed, it got in a true new xmb revealing interesting details about the device, its hardware is almost done, maybe in final revisions, and its firmware in Alpha Stage 0.930.068.
Ps4 Crash:
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Xbox One Crash:
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There is also the rummors of xb1 have been underclocked because it was with overheating problems.
Sources:
Wololo
Neogaf
Gamespot
Ps4 had some true lags, in Assassins Creed 4, the dev in the live play ($ony preconference) shaked himself when it lagged...
It looks like $ony almost finshed ps4, M$ only had the box, not the hardware... They dont even have the hardware finished, in e3 when a xb1 crashed it got in an windows 7 HP screen, when a ps4 crashed, it got in a true new xmb revealing interesting details about the device, its hardware is almost done, maybe in final revisions, and its firmware in Alpha Stage 0.930.068.
Ps4 Crash:

Xbox One Crash:

There is also the rummors of xb1 have been underclocked because it was with overheating problems.
Sources:
Wololo
Neogaf
Gamespot