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The a7R II is a 4K-capable camera with a raft of high-end features, intended to appeal to professional videographers just as much as stills shooters. 

The a7 II is increasingly looking like the odd one out in Sony's current a7-series lineup, due to its lack of a 4K video capture. Of the two cameras, the a7R II is significantly more capable for shooting video, thanks not only to the addition of 4K, but numerous other features aimed specifically at the needs of professional filmmakers.

These include an oversampled Super 35mm (~APS-C) crop mode for 4K, internal recording in both HD and 4K modes and the super flat S-Log2 profile, for additional flexibility in capturing high contrast scenes. The expansive frame coverage of phase-detect AF points in conjunction with capable face detection also means the camera can follow focus on human subjects incredibly well, no matter where in the frame they move to.

The quality of the a7R II's footage blows away the a7 II. Not only can the older camera not record 4K video, but its HD footage is softer and less detailed than the full-frame 1080 output of the a7R II. Interestingly, while the a7R II delivers its best footage - with respect to resolution, dynamic range, and low light ability - in its oversampled 4K Super 35mm crop mode (notwithstanding a higher risk of rolling shutter), it gives much more detailed 1080 video when using its entire sensor. But the basic takeaway here is that regardless of the resolution or crop mode, the a7R II delivers better-looking video than the a7 II.