As a canon user, would I like to see canon gear with specs like this? Sure. But specs on paper are far different from real world use. Canon products work great and make excellent photos, and I've never once had someone look at a finished image and say "Oh wow, that is amazing, but it would have totally been so much better if you had used X camera instead..."
I buy gear that fits my hand, meets my actual needs, and that I feel I can rely on.
As far as Canon lenses, they have 3 sets of lenses in 30 years, the EF lenses mount to EF-s cameras, and no one really talks about EF-m or whatever it is because it was always presented as a minor sideline product to the main tech to fill a minor niche, not as a front line replacement.
I have fairly high confidence that the EF lens I buy today for my current Canon camera will mount to the latest and greatest offering that Canon brings around in the next few years without needing some dodgy adaptor adding an extra point of failure to the system. Sony has all their lenses on the go in less than a decade...
Batteries might actually perform better than Sony's own documentation suggests, which I find kind of surprising as it is typically the other way around for those kind of things, but it is still not nearly up to par with what can be done with the 1dx line. I own 7Ds, and have a grip on one of them, but that doesn't remotely compare to the sealing and durability of the 1Dx.
The A9 is a sweet looking camera, and will do great in the hands of many photographers. It is however unlikely that it is going to sink Canon as a company, the same as Nikon's offerings with their awesome DR jump a few years back didn't rattle Canon's market share to a dangerous degree.
Canon EOS 7D | EF 28 f/1.8 | EF 85 f/1.8 | EF 70-200 f/4L | EF-S 17-55 | Sigma 150-500