While they share the same size (0.5″) and magnification (0.78x), the A9 OLED panel has more resolution (3,686k vs 2,360k dots) and a faster refresh rate of 100/120fps. There is a rear 3.0″ tilting LCD screen with touch capabilities on both the A9 gets more resolution with 1,440k versus the 921k dots found on the A7 mk3. 6.
I'd save up for an A7III. It's definitely better than the A7II in practically every way. I have an A7II. I bought it because it's so ridiculously cheap now, but when the A7III drops in price I will definitely trade up to the A7III. I think the better AF performance of the newer Sony bodies (A6400 and A7III) is definitely worth spending more for.
Canon and Nikon have a lot more experience with cameras. It's easy to get the impressions that everybody is switching to Sony because of the massive marketing campaign on youtube 3-4 years ago; everybody became a Sony Artisan. That being said the sensor inside the Sony is better than the one inside the Canon, especially when pushed and high ISO.
CIPA is an independent, standard measurement that determines how many shots a camera can take before the battery dies. has a removable battery. Sony Alpha 6700. Sony Alpha a7 III. The battery is removable and can be replaced by the user if broken. has a rechargeable battery. Sony Alpha 6700.zgCy11t.