Tom, no offense to Porchard, but I just don't think those numbers are right. If you shoot at the 28mm equivalent (the actual focal length is 10.4), your hyperfocal distances, according to DOF master, are approximately (I say approximately because they don't have 10.4mm available as a focal length, so I had to use 10.5):
f1.8--------------------18.5 feet
f2.8--------------------11.7 feet
f4------------------------8.3 feet
f5.6--------------------- 5.9 feet
f7.1----------------------4.7 feet
I wouldn't see any reason to shoot beyond f7.1 with this camera, probably wouldn't go past f5.6
So, at f5.6 in good light, you focus at six feet (easily done for most adults, by focussing from somewhere around the top of your head or a few inches higher or lower - depending on your height - to the ground), and everything from about 3 feet to infinity is in focus. Using the previous numbers, I'm not sure where 10
meters (or about 30ish feet) as a hyperfocal distance comes from - even wide open at f1.8 its well short of that at 18.5 feet. And even if it WAS at 30 feet, you wouldn't want to use that because it would mean that everything from about 15 feet to infinity would be in focus. Most of your shots on Flickr are taken of subjects WAAAAAAY closer than 15 feet. I'd say that some of them were closer than 3 feet, so even using the hyerfocal distance of 5.9 feet at f5.6 might not always get you close enough, although it generally would. If you focussed at 4 feet at f5.6, you'd have everything from about 2.4 - 12.5 feet in focus, which might work better for you on some of your shots. But, for heaven's sake, please don't try to focus at 30 feet!!! First of all, its nearly impossible to estimate, and second of all its just waaaaay too far, even if it was right which I can't see how it is.
Again, I would put the emphasis on a focus distance you can easily estimate. I think six feet or two meters is a good place to work from. Most adults can estimate this easily by holding the camera at about the level of the top of their head or slightly above, and using auto-focus to focus on the ground. At f5.6, you're pretty much AT hyperfocal distance and you've got from 3 feet to infinity in focus - so just about EVERYTHING except extreme close up is in focus. And in lower light, if you need to go down to f3.5 (which you can use at ISO 3200 and still maintain pretty reasonable shutter speeds - 3200 still looks OK on the RX100, especially in B&W), you'll have a zone of focus from about 3.6-17 feet. This is still a very useful zone for an awful lot of street shooting.
Zone focus is a hugely useful and effective tool, but you have to have the right numbers or at least very close to the right numbers. If Porchard can show me how his numbers work, I'll be happy to listen, but using DOF Master, I honestly don't see how he came up with them. If you want to do some of this for yourself, you should familiarize yourself with DOF Master - its got a VERY easy online calculator and the RX100 is one of the many cameras in its database that you can choose from. The thing you have to remember is to use the ACTUAL focal length, NOT the equivalent focal length. The actual range of the RX100 is 10.4mm to 37.1mm, NOT 28-100mm. Here's the website to get started, if interested:
Online Depth of Field Calculator
-Ray