I have owned my RX100m1.5 aka RX100mI.V for the last 26 months so I am will write a short user review. I call it RX100m1.5 because it is the newer version of the RX100 that comes with firmware 2.0. For full reviews check this site or other sites. This will give some details of things I discovered about the camera that I never saw mentioned in reviews.
The latest firmware version you can download from Sony is 1.1. The 2.0 is different than the 2.0 for the RX100III, etc. though. This post is from someone who found what is different in the menus and speculates that the current RX100 has an updated BIONZ processor and/or some other hardware changes that uses 2.0, but older RX100 cameras can't use the new firmware because they have an older BIONZ processor.
https://www.dpreview.com/forums/post/61429424
https://www.dpreview.com/forums/post/61586946
Note, I have the RX100 and not RX100m2, RX100m3, RX100m4, etc.
I bought the RX100 as an upgrade to my very nice Canon S95 which I have had since 2012 and it still works very well. Still looks almost new too because I keep it in a little soft case when it is in my pocket. They have a similar lens: RX100 28-100mm f1.8-4.9 lens and S95 28-105mm f2-4.9. Of course, the RX100 has the Sony 1" 20mp sensor and the S95 has the Sony 1/1.7" 10mp sensor so that is the most important difference. Looking at the DXOMark measurements for both it looks like the RX100 is about 2 stops better for noise and dynamic range.
My S95 was not my main camera and the RX100 is also not be my main camera so I don't need it to be super duper and do everything well. Basically I wanted something that is at least as good as the S95 in all ways except have a sensor that has lower noise at higher ISO and better dynamic range. The RX100 is slightly bigger and a bit heavier, but not much.
The clickless front dial is my #1 annoyance with the RX100. It annoys me every time I use the camera. I have it set for EC. With every other camera I have used I have set a dial somewhere on the camera to EC (Canon S95, 30D, 60D, G15, G16, Sony A700, A100, Olympus E-M5, E-M10, E-M10II, PEN-F, Panasonic GX7II, G3, TX1 (ZS100/TZ100) and 1 click would change the EC 1/3 stop, 2 clicks would change the EC 2/3 stops, and so on. Depending on the direction I turned the dial it would be positive or negative EC. I could do this without even looking at the camera and do it very quickly. I can usually anticipate when the camera will need some EC before I even bring the camera up. With the RX100 though you have to carefully watch the screen display as you turn the front dial for EC (and often it is hard to see in bright sun). Since there are no clicks the amount you need to turn the dial to get 1/3 or 2/3 or 1 stop of EC is pretty large. I would say you have to turn it about 1.25cm before it gets to 1/3 stop, but the amount you need to turn it varies so one time it might be 1cm and another time it might be 1.5cm and another time it might be 0.8cm. Going back to 0 also has a variable amount of turning you must do and usually isn't the same amount that you turned to set the EC. All very perverse. You have to watch the screen very carefully to see when you reached your goal and it is very easy to overshoot or undershoot. In addition, when you start to turn the dial there is a long lag before the screen display appears to show you where you are. It is a constant annoyance and worse than I anticipated because I didn't realize that the amount you must turn the dial is so far, that it was variable, and that there was such a delay in the screen display appearing.
The tiny rear dial does have click stops so I thought that although it is not what I would prefer I could configure it to do EC. No go. Lots of things can be configured on the camera, but that is not one of them. What I was able to do is configure the camera so that a press of the left side of the rear dial will go into EC mode (the default and marked function is to set the drive mode) and then I can turn the rear dial with its clicks to set EC. Still slow and it is very easy if you are trying to do it quickly to get it wrong since it so easy to think you have pressed in exactly the right spot on the left side of the round dial, but if you press in the wrong place it might detect it as having pressed the top part of the dial or the bottom part of the dial and those are different functions. You still have to carefully watch the screen to see what you are doing and that it is the correct thing.
I, of course, realize that there are pros and cons for making a clickless front dial and for making a click front dial. It is hard to fault Sony too much here since for some things such as using it to be a zoom control or manual focusing then clickless is better and, of course, for video it is silent. I much prefer the Canon choice in this regard though. Sony has a big clickless front dial and small silent click back dial. Canon has a big click front dial and small silent click back dial. No reason, I think, that the front dial could not have the silent click like the small dial though.
Note that although I have the RX100M1.5 and not the RX100M6 I have verified while at Yodobashi that the RX100M6 and RX100M7 behave the same as my RX100M1.5 in this regard.
Something I really like about my S95 is that with the camera off and the lens retracted I can press the play button to look at photos. I discovered that the RX100 can do the same thing, but I did find a difference though. With the S95 I press the play button again when I am finished. With the RX100 though when I press the play button again the camera perversely turns fully on and the lens extends. I discovered though that when I am done looking at photos that if I press the power button it will turn off, not turn on. So, there is a way to look at photos without turning on the camera and having the lens extend.
Also, if while in RX100 play mode I press the menu button then I can make changes to the menu also. The S95 can do that too.
The S95 rear display in vertical orientation would to turn black if I was wearing polarized sunglasses, but in horizontal orientation it was okay. The RX100 works in both orientations.
One problem I have had with my RX100m1.5 is that some time back the rear control wheel stopped working. Turning it had absolutely no effect. The camera has been taken very good care of and has never been wet, exposed to dust/sand, etc. I was finally able to get it working again by pressing very hard on the edge and turning the wheel around and around. It started working again, but since I also have had control wheel problems with my Sony A700 and A100 earlier I do not have a lot of faith that the problem won't recur and eventually can't be "fixed" by this method. Fingers crossed though.
