Late to the party, and thanks for the great info, a big timesaver and will be well-read methinks.
To add some info, I've been testing the rx100 on a cheap steadycam gimbal unit (Hague MMC) which I love for the fluid movement and ability to get people very naturally (over a tripod).
I've found that keeping Active steadyshot on (rather than turning steadyshot off) to produce the best effects, although this is a compromise. With the Active mode and shutter speed at 1/50th (PAL) when you're panning, the motion is OK (which is where the steadyshot is usually nasty), and when not panning, the presence of the steadyshot gives that little extra stability.
I'm also using the magfilter (works well) to add a variable ND filter which enables 1/50 shutter at f1.8 in daylight, which allows some depth of field when shooting yourself or close subjects. I keep the focus on AF-S because I've found that the face-focussing works very reliably in this mode if you give it a few seconds to settle down, including self-filming. The framing can be learned if you keep it wide open.
Now the tricky bit! Has anyone tried matching cams with the rx100? I particularly want to set up some profiles which will work with the lovely Canon HV20. The gap between the cine mode (or even Tv mode) of the HV20 an the Portrait -3 -2 -3 setting in the Rx100 is quite big. The Rx100 is still quite contrasty and intense, but does the skin tones well, to my eye. Whereas the HV20 is sometimes billious on the skin tones.
So, the question, if anyone can oblige - I'm no pro and skint - what's the best procedure for using various white balance, color correction, gamma, contrast etc. to align the footage to a reasonable extent, between the rx100 and Hv20 or similar? My NLE is vegas pro if that helps....