Yes, I see daily people selling their Canon gear to switch to Sony as I like browsing classifieds on FB and other more traditional places to buy and sell like Ebay or other forums. Mostly those that had EF mount stuff. One just has to pay attention to the classifieds.

I was just chatting with someone on FB market place about it. He switched to the Sony a7R. Plus with the pixel shift you can achieve 240mp. Things like that are far more game changing to IQ than just 1/3 of a stop improvement.

Also sales, they have radically expanded business in the last several years and have been able to surpass even Nikon and now making them number two in sales.

The AP and other agencies have made Sony their brand of choice, this is big dollar purchases of very expensive gear. Pro gear like the A1. This is not insignificant and show's that Sony is able to play with the big boys like Canon and Nikon.

When was the last time you heard of someone switching from Sony to Canon or to Nikon? I have not seen one single case of this, I'm sure it happens but it's not something I have seen. Certainly not widespread.