Sony (A mount) considering big move to Canon - Advice?

I'm currently a Sony A mount user (Sony A99 SLT). There are a few reasons I'm thinking to Canon instead of to Sony E Mount (mirrorless). But my mind isn't 100% made up yet and would appreciate any input.

I'm eagerly awaiting the Canon 5D Mark IV official specs. If it goes 4k/60p I'm going to be excited and that might seal the deal. I do think the A7R2 (Sony E mount) is a fantastic camera, and there's still a small chance I might switch to that. But being with Sony now, I hold Nikon & Canon in higher regard when it comes to quality, durability and longevity.

My summary: I'm a landscape/cityscape amateur photographer and will be moving into more professional portrait, architecture/real estate & potentially wedding photography shortly. While cityscapes are my passion, a 4k capability is important to me. And I'd like to stick with one system for lenses. So it would be all Sony E-mount/mirrorless for photos+video or all Canon for photos+video)

Here are my reasons for the potential switch to Canon:

1. After buying the flagship Sony A mount camera system a few years ago, I'm now learning the entire mount is most likely dead and the value of my existing glass will go down even more. And, obviously, no more new A mount glass. The Canon EF mount will be around for awhile.
2. Canon's lens selection is FAR superior. And access to more 3rd party glass, including native support for Zeiss Otus & Milvus. Yes you can adapt Canon lenses to the A7R2, but autofocus speed is TERRIBLE for AF lenses. Sony's A mount selection is decent (my current system), but its dying. And likewise A mount to E mount converters have slow AF.
3. Sony's flash sync system is terrible. Native & crappy/expensive wireless support is just launching now for E mount. No native wireless support and VERY limited 3rd party options on my Sony A99 (A mount). On Canon native wireless is built right into many cameras, no messing around with infrared transmitters.
4. Canon build quality seems higher than Sony. I've had heard about a higher rate of Sony A7R2s failing and having issues than Canon (& Nikon) cameras.
5. Canon (& Nikon) have better support options. I belong to Sony pro support, but I still have to send my gear to a 3rd party in the US for repairs.

I'd love to hear your thoughts before making the substantial financial dive. Thanks again.

For  Sony, my guess from inspecting badly colored examples of photographs is that incorrect post processing of the compressed raw format is responsible for the problems that I have seen.

A gray scale ought not to wander away from neutral in the direction of magenta and then green. Surely there is a brand of post processor that will decode the Sony format correctly.

I sold my Sony a850 (which I loved) and my remaining a mount lenses this spring and switched to Canon. I did consider the A7 cameras very carefully before making the decision.

Your needs and budget are probably different from mine but there are two key considerations I think:

1. EVF – doesn't look like you are going to get one in a Canon for a while. So if you like working with one it's worth giving that some serious thought.

2. Lenses – I can't justify a lot of expensive lenses and I like using native lenses. Canon offered a greater range and much better value allowing me to build a system that suits my needs and budget. FE mount lenses are expensive for what you get IMO and I was quite concerned about the optical quality of the lenses and the overall QC. I don't want to buy a 35 1.4 FE only to find it is decentered.

Hi,

Whilst im not interested in 4K video, I made the switch from a99 and zeiss/ Minolta G glass to canon 1 series and L glass and couldn't be happier. The Sony a99 was lovely, but so are the canon bodies, and I've not got the latest ones, but 1ds mk3 and 1d mk4, both superb. I was never impressed with the Sony build quality or the AF performance, especially tracking. The canons are better AF and vastly better build. Also, like you say, they have a great lens lineup (both old and new) and a much better flash system. I missed the EVF for a start, but once you get used to the OVF, it's not an issue.  I certainly don't regret switching.

Hope this helps.