After 15 years of shooting with Canon camera bodies, I have switched over to Sony. I recently picked up the Sony A7iii and over the last 2 months, I have been absolutely blown away by the images and video this camera produces. Sony classifies this camera as it's "basic" model, but I have yet to see anything basic about this camera. I am still using my Canon lenses on this body. Honestly, I do feel that this camera's sensor is helping enhance the ability of my Canon lenses. I am using the Sigma MC-11 which allows me to use my current Canon lenses. I might consider making the full switch eventually, but so far I have no complaints with the Sony / Canon Combo.
The Sony A7III is a 24.2MP Full Frame camera, and it offers 693 phase-detection / 425 contrast AF points w/ 93% image coverage. This camera has a 15-stop dynamic range, and when you tested in the field, it's absolutely amazing to see how well it handles the dynamic range. You are able to pull out so many details from the shadows, that you couldn't have before. I am coming from the Canon 5DMkIII and the dynamic range alone was such a massive upgrade for me. In addition, the camera offers 10 FPS, dual-SD card slots, a larger battery than the A7II, and has the ISO range of 50-204,800. The example shots below, you can really see how amazing that low-light performance really is, when I was shooting the Milky Way. For its price point, you are getting a Full Frame Mirrorless camera, with 4K video, amazing low light performance, and insanely well done dynamic range. It's the camera that is the best gateway for any Canon abandoners.
I am still testing out the limits of this camera, but it has surpassed all of my expectations, to the point where I have already sold my Canon 5DMkiii. The battery life will last you a full day of shooting unless you are recording in 4K video. The dual card slots are extremely helpful and with the ability to share pictures from your camera to your phone. It makes it so much easier to post content while out in the field. At the price point of just $2000, this is definitely by no means a basic camera. I will do a thorough review of the MC-11 in the weeks to follow.
You can buy it here: https://amzn.to/2PAlq5M
Would you consider making the jump from Canon to Sony? What's holding you back? Maybe I can help answer in the comments!