Surface area: 337.50 mm². vs. 864.00 mm². Difference: 526.5 mm² (156%) 5D Mark III sensor is approx. 2.56x bigger than 80D sensor. Note: You are comparing cameras of different generations. There is a 4 year gap between Canon 80D (2016) and Canon 5D Mark III (2012). All things being equal, newer sensor generations generally outperform the older. Description. The EOS 5D Mark III is a full-frame 22.3-megapixel DSLR with 61-point autofocus and 6 fps continuous shooting. Capture high-quality Full HD movies, with manual control over everything from frame rate to audio. Even thought the 5D3 may only max out at write speeds of about 60-80MB/s, you will see that those speeds are only attained with cards that are rated for much faster speeds. You really don't need all that speed as the 5D3 has a very good buffer and faster cards just clear the buffer more quickly. Canon 7D Mark II specifications: Your purchases support this site. Body Only. Body Only; Body with W-E1 Wi-Fi Adapter; Kit with 18-135mm Lens; Like Canon introduced on the 5D Mark III, the new I used a 5D Mark III as my primary body from 2014 until 2019, when I bought a 5D Mark IV. Now the III is my backup FF body. The IV, to me, is the camera I was hoping the III would be. The EOS 5D Mark III is part of the world famous EOS range of high performance DSLR cameras from Canon. Offering a staggering array of improved features, higher-speeds, greater resolution and extended creative options in both image and video departments, the EOS 5D Mark III is sure to provide unmatched artistic freedom for the most demanding and quality conscious photographer. hJR1J.