Sensor quality – Here I would say I am interested in producing natural colours and smooth images (free from noise). The LX7 is better than the LX5 but neither can touch the Sony. The Sony has smooth images with very limited noise that doesn’t get exaggerated when the images are processed. The colours from the Sony are also very lifelike. I have often thought the Panasonic colours, especially Green, look a little unnatural. The ISO performance of the LX7 is better than the LX5 but the Sony is much better than both of these. As I shoot most of my work at base ISO and hardly ever go above ISO800, the LX7 and RX100 are fine. The LX5 struggled above ISO400.
Pixel Count – This only becomes important if you are going to be producing large prints and by that I mean above A3+. The Sony will produce a slightly larger than A3+ print at 300dpi without any enlargement whilst you will need to enlarge the LX5 or LX7. What is interesting is that some of the LX5 or LX7 images enlarged appear sharer and more detailed than the Sony. If you go to A2 printing the LX5 and LX7 can achieve this is you take care whilst the Sony can be enlarged to this easily but it can reveal the soft corners (I said it was irritating). If you are only going to share your images on the Internet then any of the cameras will be fine.
Filters – I shoot landscapes so I need to be able to attach square filters such as ND Grads. All three cameras allow this but the LX5 requires a bulky tube to be attached. I hated this as it stopped the camera fitting easily in my pocket. The LX7 uses a screw in adapter which I like but I can’t leave the filter adapter ring attached as it jams the lens when it retracts. It also causes vignetting at the 24mm end when shooting 16:9 format (which I do alot). The RX100 filter adapter is a stick on affair which is very slim and works well but it’s expensive.
Handling – I find the RX100 small to handle but it is improved by the addition of the Sony leather half case. The layout and dials are good on the RX100 as is the front aperture ring which can be switched to other purposes such as focussing. The LX7 has a great aperture ring and I love the format switching ring. The LX5 is similarly good but lacks the aperture ring. If pushed I would say the LX cameras are easier and faster to work with than the RX100. If your bag is street photography then I think the LX cameras are probably better to work with.
What this all means is that for me, none of these cameras is perfect but all will perform well and achieve the results I want. I suspect (unless you see something above to convince you otherwise) that they would also serve you equally well. The best advice I can give is what I started this blog with – understand what features are important to you and why before investing.
If I had to use just one camera it would actually be the RX10. It has the great sensor of the RX100 but the lens is amazing. Its failure (if you can call it that) is that it’s significantly larger than the others and won’t fit in your pocket. Surprisingly my Olympus EM5 is quite a bit smaller than the RX10 and produces the best image quality of all the cameras – I still can’t fit it in my pocket unless I am using prime lenses.
Remember, no camera is perfect for all tasks.