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The a7R III doesn't offer increased resolution when compared with its predecessor, but that doesn't mean it's not a serious upgrade. It takes a sensor that's already proven to deliver excellent performance and ekes a bit more dyanmic range out of it, while other upgrades are more palpable.

Proven 42MP full-frame sensor; Improved processor and autofocus system; 10fps image capture with tracking; Silent shooting option; Tilting touch LCD; Dual card slots; Larger battery than a7R II

Only one card slot supports UHS-II speeds; No built-in flash; No in-camera time-lapse support; Can't start video until image buffer is cleared; Dense menu system

When Sony unveiled its top-tier flagship full-frame A9 , we wondered when the camera's top-tier features would trickle down to lower-priced models. Surprisingly enough Sony didn't take long to announce the A7R III, which had many of the same features that made the A9 great in a slightly cheaper...

At its core, the a7R III can be seen as a mashup of the best parts of its predecessor, the a7R II, and Sony's sports-shooting flagship a9. As with Nikon's D850 for DSLR users, the a7R III has the potential to be a 'Goldilocks' camera for those looking at mirrorless solutions.

With big improvements to battery life and performance, Sony's A7R Mark III is a worthy successor.

42.4MP full-frame sensor; 10 FPS burst shooting; Vastly improved battery life; Improved image stabilization; Improved AF performance

No "anti-distortion shutter" rating; Burst mode limits compressed RAWs to 12-bit

Editors' note: Updated Oct. 27, 2017, with some verdicts and photo samples based on a few hours shooting with the A7R III.

With a better autofocus system, Sony's follow up to its A7R II flagship full-frame mirrorless keeps the stellar photo and video quality but makes it easier to get.

Sony's Alpha A7r Mark III is a full-frame mirrorless camera with 42.4 Megapixels, 4k HDR video and 10fps burst shooting. It keeps the sensor of the Mark II but improves the dynamic range, upgrades the AF speed, adds twin SD slots, an AF joystick, PC Sync port, and the Quad VGA viewfinder and...