I don't know anyone who thinks Canon has better image quality anymore. Though they are starting to catch up to the others.
And never ever follow the "pros"... You wouldn't buy your family sedan based on what brand professional race car drivers are driving.
Pros are drawn to Canon for reasons that are entirely irrelevant to ordinary customers:
1-- CPS-- Canon Professional Support, their support program for pros is spectacular. But only pros can use it. For example, at the Olympics, they maintain a full inventory of loaner equipment, they maintain on site staff to clean and repair gear.
2-- There are only 2 truly completely professional models that exist -- the Nikon D5 and Canon 1dx series. The race cars. But the great Canon race car doesn't make a Canon minivan any better than a Sony/Fuji/Olympus minivan.
3-- Momentum. Canon has been around a long time. Their current mount system is 30 years old. If you got your professional start 10-20 years ago, it was probably on Canon. And once you start, you don't switch generally. Canon makes great cameras, and their system has many pros and cons. In the end though, every other system is just as good, but with different pros and cons. Image quality is an area where Canon has fallen behind, but they are starting to catch up. And we are really only talking microscopic differences. Some jpeg shooters really like Canon jpeg rendering. Sony/Nikon sensors have a noticeable raw shooting advantage with a great degree of ISO invariance.
Personally, my favorite thing about Canon is their lens lineup. Nikon is almost as good. Sony now has many lenses superior to Canon lenses, but Canon still has a much broader selection with better price points. I also like Canon's touch screen integration and their dual pixel AF.
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Canon obviously has better image "IQ" although Nikon and Fuji are catching up (except for mirrorless - is Nikon even making mirrorless cameras anymore) Sony is not far behind but you would need to sell a kidney to buy their lens.
Canon has a larger and better selection of lens (duh !)
Canon lens are cheaper
Canon is the preferred choice for photo "enthusiasts" and professional photographers. Nikon is the choice for beginners until they eventually upgrade to Canon
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