I've previously owned Nikon gear and currently own quite a bit of Canon gear, but it was time to upgrade to mirrorless. I have extensive professional experience

I've previously owned Nikon gear and currently own quite a bit of Canon gear, but it was time to upgrade to mirrorless. I have extensive professional experience with both digital imaging and filmmaking going back decades. A variety of things made the A1 a better overall fit for my unique mix of needs and interests. At the extreme high-end of current mirrorless cameras (>$5k without lenses) any major brand's latest flagship will very likely far exceed the needs of almost all users. If you don't already know why you'd choose one brand's flagship over another, you probably shouldn't be considering any flagships. Frankly, these are highly specialized, complex and esoteric tools that are also incredibly expensive. I recommend starting out with more mainstream models which are already supremely powerful and quite a bit less expensive than top-of-the-line models. Check out recent mainstream model reviews at DPReview.com - a highly credible source of objective comparisons. Professional digital cameras are a mature and highly competitive market that's changing frequently. No major brand is overall "better" than another. It's more about finding the best fit between your needs, skills, budget and preferences within a certain price and application segment. Any camera/lens combo represents a set of trade-offs between a dozen or more variables including light sensitivity, shutter speed, zoom, depth of field, video capabilities (resolution, frame rate, bit rate, compression, etc), weight, size and flexibility.