I think Sony is on the Iphone schedule, or in other words consumer electronics.
Ship, send, wait . . . then ship send wait . . .
That's their business model, can't knock it if it works, but for a user that has work to do, waiting for the right use camera is not an option.
I'll see what Canon does next. If the 1dxII is really a multimedia camera for professionals and the footage holds up in post i'm good, if not I'll stay with what I have and probably ad a C300II.
IMO
BC
Lots of pros around here using the A7II/r/rII/s right now. Particularly the A7II and A7rII, it seems, for everything from wedding videography, to studio work, to even photography, to landscapes and architectural work (for the latter, it's pretty much a no-brainer). It doesn't work for some things (chiefly fast action, I don't know anything about video), but, for the areas it works in, it does extremely well. There's a reason so many people are showing up to paid shoots these days with Sony bodies and non-Sony lenses.
It's definitely a work in progress, though.
I'd say the release schedule is more like that of an emerging, rapidly-progressing product than that of a consumer product. Canon/Nikon only release a 1Dx or D800 every three years or so because, any less than that, it wouldn't be worth upgrading. Even with a three year cycle, the improvements are largely incremental, since it's a mature product - there are more improvements between Sony cameras 1 year apart than between Canon cameras 3 years apart. Once mirrorless technology - specifically, the speed and accuracy of AF and intelligent acquisition and tracking (face detect, eye detect, detect animal, follow red cars only, etc.) - becomes more mature, I'd also expect Sony to settle into a slower product cycle.