I also have the Sony RX10 possessed a very good camera in principle, but the Panasonic has the following strengths compared with the Sony:
1. In all areas much faster. Switch, auto focus, image processing, zoom, trigger, everything runs extremely smoothly and quickly, because the Sony is not in the above areas.
2. A 16x optical zoom to 400mm at the Panasonic, so the double focal length compared to the Sony.
3. 4K video with the ability to drag-camera 8 MP photos from the video made. This video resolution is fantastic if you've seen it once, and future-proof for the coming years. The Sony has just the usual FullHD.
4. When the Panasonic better, user-specific calibration of image values such as contrast, color, sharpness, noise.
The Sony again has a continuous "light intensity" with an aperture of 2.8 at all zoom settings, so in dark situations has the lead. However, I also presented a total for direct image-to-image comparison with identical shooting conditions and parameters to determine that the picture quality of Sony RX10 against the Panasonic FX1000 is a little better, especially as regards the freedom from noise. One can at the Panasonic indeed set the "Noise reduction" in several stages, but at the level of Sony it loses details. Incident on only exact compare and at 100%. Even with the Sony the entire zoom range from 25 to 200 is knackscharf that Panasonic is weakening slightly in the maximum wide-angle position. This is probably due to the structural design of the 25-400mm zoom lens. Sony has kept the focal length is less, but still a little bit of order out tickled more image quality.
In the direct comparison I noticed also that the Sony in strong contrast ratios light / dark tends to overexpose bright areas hard to produce so quickly "blown-out" lights. The Panasonic operates as a balanced and with higher dynamics. Sony tends to be especially crisp image display that is well received at first sight for most buyers because the picture taken has strong contrasts. Taking a closer look, but sink a lot of detail in the dark and light areas where the Pansonic still shows a bit more. I speak here only incidentally on JPEGs. The possible RAW processing is another and special chapter.
As for the case: The Sony should be well splashproof and internally have a magnesium casing. Maybe, but my copy was not now stunningly well made, for example, had the back of an easy game and gave the firm grab for something. The Panasonic acts - even if not splashproof - solid to me, still has a few more little buttons and a thumbwheel for single-shot / sequential / bracketing / interval / self-timer, is therefore even more user-friendly. Advantage of Sony again, sideways, zusäzliches compartment for the SD card. The Panasonic is found card and battery in the bottom and together in a timber.
Overall, I think that Panasonic clearly more to offer than the Sony. In particular, the speed at which you are traveling, undermines the Sony off the water. As I take in buying, partly not quite get at the noise freedom of Sony. For this, the Panasonic is a real Super Zoom Macro (+ Macro Zoom at any time) to 400mm telephoto, so full of "Zoo-fit" of butterfly to monkey enclosure. Frankly, I find no real argument for buying the Sony, unless you are on the RX-series and has become accustomed to the menu and the service.