I own an EOS 5D Mark III - should I buy a 6D Mark II?
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I own an EOS 5D Mark III - should I buy a 6D Mark II?

On balance, I'd say yes. If you replace your 5D III with a 6D II you'll get a faster, lighter camera with a (slightly) higher resolution sensor, a much more usable live view feature, and amazingly accurate autofocus in both live view and video. Be aware though that if you shoot sports or action, or anything where a wide AF array is useful, you might find the 6D II's smaller PDAF array coverage a bit limiting.

One area where the 6D II's AF system exceeds that of the 5D III is when it comes to wildlife photography: the former offers 27 AF points that focus with lens+teleconverter combinations offering maximum apertures of F8. Only the 5D III's center point works down to F8.

The 6D Mark II also adds built-in Wi-Fi and GPS, which in my experience are features that photographers tend to only really appreciate once they've used a camera that offers them.

One counter-argument is that the 6D Mark II probably won't represent a huge step up in terms of image quality, at least at low / medium ISO sensitivities. While the more modern 5D IV offers greater dynamic range, indications are that the 6D Mark II's Raw latitude is basically in line with that of the 5D Mark III, albeit without the banding problems.

Compare the Canon EOS 6D Mark II to the 5D Mark III

Another possible point in the 5D III's favor is that while the 5D-series has earned a reputation for reliability over time, the 6D Mark II is an unknown quantity at this point. It is weather-sealed though, so you should be able to use the 6D II for travel and outdoor photography in moderately wet conditions.

If you're itching to replace your 5D Mark III, you should also consider the 5D Mark IV. It's more costly than the 6D II but offers nice extras like an AF positioning joystick, greater resolution and the option to shoot 4K video.