Hi!
I own both the keyboard and module versions, and I think the module has a brilliant user interface and is almost as quick to use for sound design as the keyboard version.
The keyboard looks and feels really nice, but it is still not knob per function. There is only one set of oscillator controls for all oscillators, so you have to switch between them with the oscillator selection buttons. And even on the keyboard I like to see the current parameter value in the display before I turn a knob. So for example when I am adjusting the oscillator shapes for multiple oscillators, I have the "Osc shape" tab selected on the display, and when I want to adjust the oscillator levels, I switch to the "Osc level" tab on the display, even though I could just have turned the level knob and not worried about the display. Since the oscillator controls are shared for all oscillators, the indication on the knob itself is not relevant when you switch to a different oscillator. This is what makes me want to use the display to see which value I am coming from before I turn a knob. Sometimes when I switch to a certain tab on the display, I instinctively reach for the relevant soft knob above the display, rather than using the dedicated physical knob for that parameter.
I hope the above explanation makes sense, even if you are not familiar with P12 keyboard user interface.
So, in short, I use the keyboard UI almost like the module UI. Others might of course use the keyboard differently, taking more advantage of all the dedicated knobs, turning them without worrying about the display and just listening to the result, thus perhaps working quicker and more by ear in a way that is not quite possible on the module version UI.