Now, let's talk about some of the biggest benefits of using a Canon 5D Mark IV in 2023. Sensor Quality. The 5D Mark IV has an awesome 30.4-megapixel full frame CMOS sensor. It is a departure from
While the 5D Mark IV has the specifications that create marginally higher-quality images and videos, the 6D Mark II features more modern controls and options that contribute to ease of use. Which of the two cameras to get really depends on how much time and effort you invest into photography or filmmaking.
I wouldn't bother with the 5D II and its fixed pattern banding, the 5D III is good but doesn't have the 5D's look, and the 6D has the best image quality by far of those three but it's not the same look as the 5D, only the Mark II N has that look I know you want.
Yet, they knew that image quality is the #1 selling point, so they couldn't market it with, "Same image quality with better AF and lots of tweaks." Instead of making improvements to the sensor hardware, they increased the noise reduction in JPEG processing and allowed two stops higher ISO--equivalent to pushing a 5D2's "H2".
Canon 5D Mark III vs. Fuji X100S image quality 09 January 2014. Canon 5D Mk III vs. LEICA M 240 vs. Sony A7 Image Quality Comparison 19 December 2013. Canon 6D. Similar image quality smaller, lighter package with a few less controls, but with added Wi-Fi and GPS. Canon 5D Mark III versus Canon 6D.

At ISO 25,600 the Mark III shows a bit more noise than the 5D Mark II at 6400, but the Mark III has the edge in detail and sharpness. When you apply the Landscape preset of Noiseware then you end up with an image that is quite usable. I think this clearly demonstrates that the in-camera JPEG quality of the 5D Mark III is significantly sharper

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canon 6d mark ii vs 5d mark iv image quality