Please read this page BEFORE using the DxOMark Sensor image quality comparison tool:

First, here are few facts and principles to know about the DxOMark Sensor scale before drawing conclusions from any data and rankings published on dxomark.com:

1. DxOMark Sensor scale and dxomark.com measurements reflect only the RAW sensor performance of a digital camera. All measurements are performed on the RAW image file BEFORE demosaicing or other processing prior to final image delivery. Dxomark.com does not address such other important criteria as image signal processing, mechanical robustness, ease of use, flexibility, optics quality, value for money, etc. While RAW sensor performance is critically important, it is not the only factor that should be taken into consideration when choosing a digital camera.
2. DxOMark Sensor AND resolution are two independent metrics of sensor performance. As a consequence, just because camera A has more pixels than camera B (and thus sees more details) does not mean that its RAW DxOMark Sensor score will be better. So before comparing cameras with DxOMark Sensor, it is important to first determine the resolution you are looking for (which largely depends on the size of the screen or the print you intend to use or produce). Once you choose an appropriate resolution, the DxOMark Sensor scale becomes a fair and powerful tool with which to make comparisons.
3. DxOMark Sensor scale is based on three photographic usages—Studio, Landscape, and Action photography. The three scenarios are equally weighted in the DxOMark Sensor scale results. If photographers are more inclined towards a specific scenario, they should look at the individual metric that best meets their needs—i.e., Studio photographers should primarily consider Color Depth and Dynamic range, Landscape photographers should primarily consider Dynamic Range and Color Depth, and Action photographers/Photojournalists should pay most attention to Low-Light ISO and Dynamic Range.
4. DxOMark Sensor scale is logarithmic and a 5-point difference on the scale corresponds to a gain or loss of sensitivity of 1/3 of a stop. We nevertheless report DxOMark Sensor Scale test results to one decimal place to avoid the clustering of data that would occur with any arbitrary algebraic rounding.
5. DxOMark Sensor scale is normalized for a defined printing scenario—8Mpix printed on 8”x12” (20cmx30cm) at 300dpi resolution. Any other normalization, even with higher resolution, would lead to the same ranking, given that any camera which could not deliver the chosen resolution would be eliminated from the comparison.
6. DxOMark scale is open and it is not a percentage. It has been computed so that the current set of cameras from low-end DSCs up to professional DSLRs and medium-format cameras show results within a range from 0 to 100. However, new technologies may well lead to higher performance models.

Second, here are three steps to better use DxOMark Sensor scale:

1. Identify your preferred scenario(s): General, Studio, Landscape, and/or Action.
2. Choose the resolution you need for your photography usage.
3. If you shoot in RAW, DxOMark Sensor will help you rank the best cameras according to the resolution and usage scenario that you have chosen.