DxOMark published their test results for the Leica M11 sensor which scored 100 points and is one of the top 5 sensors currently available on the market today:
Comparison with a few other cameras:
From DxOMark:
Welcome Leica Camera M11 to the Top 5 Full-Frame Sensor rankings with a score of 100! The Leica M11 soars beyond its predecessor, the M10 which had an overall score of 86, demonstrating its significant improvement and excellent performance.
The Leica Camera M11 is the most refined version of the digital M-type rangefinder models to date. It achieved a Landscape (dynamic range) attribute top score of 14.8 and the sensor performance is at the leading edge, especially regarding color depth.
Leica M11 pre-order links: