simonxu11 said:
Please don't take DxO marks too seriously, check these marks:
Nikon D5100 is 80
Leica M9 is 69
Sony Nex 7 is 81
Canon 5D mark II is 79
I think they always favour to Nikon or Sony sensors
They don't 'favor' those sensors because they like those brands better. The data are what they are. The important point is to understand
what DxOMark is measuring, and consider those factors which matter to you. The numbers you list are their overall scores, which are a composite of measurements of color depth, dynamic range, and ISO noise. The NEX-7 (APS-C sensor) beats the 5DII (FF sensor) because the Sony sensor has slightly better color depth and much better dynamic range, but the Sony also has much more ISO noise. So, if ISO noise is what matters to you, the 5DII is a better choice, even though the NEX-7 scores higher overall.