Bit these were shot with my Sony HD video camera. It does some things extremely well. Other things, like landscapes... not so good. Flesh can be really challenging because HD has such incredible detail you see every flaw.
Most modern cameras can shoot both video and stills and many, like mine, can do both simultaniously. The overall technology is identical with the notable exception of the shutter, which on a still camera will most often be a diaphraghm(leaf) type, while on a video camera will be a rolling type (which can make for some really strange and cool effects).
As mentioned, the camera does have Zeiss optics with an ok telemacro... (with optical stabalization, not digital which can be nasty) so it is pretty decent considering it is consumer level. I also just discovered that one of my favorite recent films (Crank) was partially shot on a nearly identical type camera made by Canon. And that was a big screen feature.
So, the long and the short of it is, much like music, equipment is only part of the equation. I have being doing photography for 35 years. Built my first dark room when I was 13. So, really, I can do this with just about any camera.
Steve - No, I lock my ISO to 100. I am old school. I use lighting instead (in this case nearly direct 2pm sunlight). That way the aperture can be cranked open, and a softer DOF focus with a nice bokeh achieved.
Perhaps on higher end equipment ISO will not be so problematic, but so far (in the sub 2000 dollar range) I have found that as the ISO goes up, so does the noise, and its not good noise. With the old real film ISO, the image would be much more grainy at high ISO, but it was pleasant to view. Digital noise is not.
I am pretty convinced that what camera manufactures call ISO, we musicians would simply call gain. And that is a sure fire way to add noise.
The video camera I am saving to buy (Sony NEX VG900) has a full frame (35mm) Examor sensor that I hope will reduce that issue considerably, and of course having an interchangeable lens system on a 35mm sensor means it will properly focus real 35mm camera lenses (cine or still).
Thanks for the kind words guys.