My experiment was to determine which of the two cameras performed better under similar circumstances (equal lenses, equal lighting, equal settings). Yes, I could do post processing or tweak settings to improve the images from either camera, but doing that would defeat the purpose of my experiment; to determine which of the two cameras performs better.
And before a few of you start flaming me for daring to try to get a good image "straight out of the camera", please consider that I didn't buy into these two systems recently. I have been capturing images since the late 1970's. Yes, a camera is a "tool", but crappy tools lead to mediocre results at best. I'm sure there are folks who can capture insanely great images with a flip phone (yes, flip phones from per-smartphone era), but if those same "flip phone photographers" used a Nikon D850 or Canon 5D Mark IV with a professional grade lens to capture the same exact image, I'll bet the image captured with either DSLR combo would blow the flip phone image out of the water in terms of IQ. If not, why are we wasting time on these forums discussing the virtues of our beloved camera equipment?
Yes, I could have done a more detailed scientific experiment by taking several thousand images at each possible setting under perfectly controlled conditions to compare the results, however, the idea was to remain as close to "average Joe" use; Average Joe (like myself and probably 95% of the population), takes his camera on an outing to capture images of landscape, quick impromptu portraits, etc. Average Joe wants to see nice images when he gets home. Which camera will have a higher probability of capturing NICER images for Average Joe?
My findings:
- Nikon D750 with Nikkor 16-35mm f4.0 images are mostly underexposed, colors are a bit warmer in the yellow spectrum, details are slightly better than Canon's. Highlights are not as blown out as Canon's making it easier to salvage a image in post processing. This in turn leads to displaying better dynamic range in post processing.
- Canon 6D Mark II with Canon 16-35mm f4.0L images are severely overexposed on some images, colors are not as "orangy" on the yellow spectrum, higher contrast in images makes for blown out high lights; post processing will be way more challenging. Details are not as accurately captured as Nikon, but they are not too bad.
Overall, my personal experience with both cameras is that neither one is perfect; each has its limitations. The Nikon D750 outperformed the Canon 6D Mark II in terms of IQ.
On a personal note; I have no immediate plans to sell off either camera system. I have equal lenses in both systems. The only upgrade I would like to do is go for either a Canon 5D Mark IV, or a Nikon D850 someday. If I decide to venture into the mirror-less world, I would have to see how it develops in the next couple of years before I spend any more money. If anything, I might consider buying Nikon F to Z and Canon EF to R adapters soon just in case...