It's always a matter of how well you use your resources, it's why John Carmack said no system's actually reached 100% (I think Crytek boasted doing that with last gen consoles but screw them, they were speaking as PR rather than programmers anyway) and even when you do max out a system there's a matter of HOW you're using your perfectly optimized code or whatever. Max posso nos detail/effects while still being 1080p, or 60fps, or both.
Though, yeah, Sucker Punch can focus solely on PS4 and aim for certain baselines, while Watch Dogs needs to be spread thin. I do think things will be better relative to PS3/X360 for release quality though with PS4/XB1 having similar hardware and PC being PC, but that won't be a sure thing until PS3/360 are shaken off and perhaps Wii U neglected.