Difference: 3.6 mm² (0.4%) 5D Mark III sensor is slightly bigger than D4s sensor (only 0.4% difference). Note: You are comparing cameras of different generations. There is a 2 year gap between Nikon D4s (2014) and Canon 5D Mark III (2012). All things being equal, newer sensor generations generally outperform the older. Pixel pitch. The Canon 5D enjoys external dimensions of 152mm x 113mm x 75mm (6.0" x 4.4" x 3.0") along with a weight of 895 grams (1.97 lbs) whilst the Pentax K-3 III has specifications of 135mm x 104mm x 74mm (5.3" x 4.1" x 2.9") with a weight of 820 grams (1.81 lbs). See the Canon 5D vs Pentax K-3 III in our brand new Camera plus Lens Size Comparison Tool. Sensor Size. Savings & Stock. Customer Rating. Pentax K-3 Mark III Monochrome DSLR Camera. Canon EOS 5D Mark IV DSLR Camera with 24-105mm f/4L II Lens. Sensor size (mm) 24 x 36 : Color filter array: RGB : Pixel pitch (µm) Bits per pixel: 14.0: Canon EOS 5D Mark III Panasonic Lumix DC-S1R F70bB.