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First things first, the 5D does make one wonder if pixel counts are getting a bit out of hand. The amount of resolution its descendent, the 5DS R, boasts over its granddaddy is almost humorous, but the file size isn't. Load times on the 5D's much smaller JPEG and Raw files is a breath of fresh air over the 5DS R's uncompressed Raw files that are starting to approach 100MB/image. That said, bigger file size is a small trade-off for better overall performance.

There's a ton to look at when the Canons are arranged chronologically like this, so we will just quickly touch on some overall impressions. 

JPEG processing has evolved with each generation, with one of the obvious changes being the sharpening algorithms used with the 5D Mark III. We can see it is much more aggressive on the III, with halos starting to appear around the text.

Noise reduction has gone from letting lots of chroma noise through at ISO 3200 to eliminating it, to a smarter algorithm with more sophisticated noise reduction in the 5D Mark III.

The fabled Canon colors appear to have largely remained the same, which is a good thing.

Lastly, high ISO performance has greatly changed. Even in our full-resolution view, the 5D Mark III appears to show as much noise at ISO 3200 as the maxed-out 5D. Normalize the view and we see performance get better with each iteration, until we reach the 5DS R. One can only hope that the 5D Mark IV carries on the noise performance progression the previous generations began.

Even for an 11-year-old 12.8 MP camera, the 5D's performance at base ISO is very good, with its only major flaw being the amount of color aliasing finding its way in to the scene, with even the center target showing false color. Outside of those situations, a beginner on a budget does have a usable affordable full-frame option, just as long as it hasn't been abused.