Samsung WB850F has a 16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor . You can shoot at maximum resolution of 4608 x 3456 pixels with aspect ratios of 1:1, 4:3, 3:2 and 16:9. WB850F has a native ISO range of 100 - 3200 but unfortunately, Samsung WB850F doesn't have RAW file support. If you need a Compact camera with a RAW support, consider Sony ZV-1 or Canon PowerShot G5 X in the same price range.
Samsung WB850F 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 Samsung WB850F vs Canon SX740 HS or take a look at Highest resolution Compact cameras list.
Let's look at how the size of the Samsung WB850F's 1/2.3-inch sensor compares with other standard sensor sizes.
Comparison image of Samsung WB850F Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Samsung WB850F gives you at any given aperture.
You can
calculate
the exact depth of field for the Samsung WB850F
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.