I never understand people who say they'll only use ISO up to x. You guys must have amazing self control. I haven't. If I see a picture I want to take and I have a camera with me I take the picture no matter what the ISO goes to as IMVHO any picture is better than none and if it's useable, great, and if it isn't at least I tried and maybe it'll work as a mono
Sometimes wider apertures and longer shutter speeds just aren't the answer and upping the ISO is the only thing to do, if you want the picture. I suppose you guys just stop and put the camera away.
I've never used a Sony RX100, I went for the Panasonic TZ100 and for me that 1" sensor camera can give a useable picture at ISO 12,800. There'll be noise of course but a whole picture could well be useable.
Thinking back to my film days taking pictures in clubs ISO 1600 was if I'm remembering it right pretty noisy plus I'd be at double digit shutter speeds which were next to useless for people shots. I think I'd possibly take my Panasonic TZ100 (1" sensor compact) at ISO 12,800 with all the benefits that brings for shutter speed over anything I got from film. I know it's not the film days any more but for convenience I do think that these 1" sensor cameras can have their uses when we don't want to use anything bigger and if we can avoid pixel peeping.