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It is a DSLR that functions most reliably when used in live view, thanks to its excellent Dual Pixel AF system. Through-the-finder AF is less reliable, by comparison. The camera also offers excellent Raw image quality and usable full-width 4K in a well-built, weather-sealed package with fabulous ergonomics.
The Digital Picture
If I had to pick a single do-everything-well DSLR camera that does not cost a fortune, the 90D would now be my recommendation.