Leica V-Lux 20 has a 12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . You can shoot at maximum resolution of 4000 x 3000 pixels with aspect ratios of 4:3, 3:2 and 16:9. V-Lux 20 has a native ISO range of 80 - 6400 but unfortunately, Leica V-Lux 20 doesn't have RAW file support. If you need a Compact camera with a RAW support, consider or in the same price range.
Leica V-Lux 20 is not the highest resolution Small Sensor camera. Canon SX740 HS with its 21.0MP sensor is leading in this class. Check the comparison of Leica V-Lux 20 vs Canon SX740 HS or take a look at Highest resolution Compact cameras list.
Let's look at how the size of the Leica V-Lux 20's 1/2.3-inch sensor compares with other standard sensor sizes.
Comparison image of Leica V-Lux 20 Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Leica V-Lux 20 gives you at any given aperture.
You can
calculate
the exact depth of field for the Leica V-Lux 20
at any focal length, aperture and subject distance, including the hyperfocal distance
for landscapes and how close you can get before the focus zone becomes too thin.