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The 'S' and 'R' stand for Sensitiviy and Resolution, respectively. The a7sii has 12 uniquely large MP to capture tons of light, giving it a professional video advantage. The a7rii has 42MP (in addition to a better processor if I'm not mistaken) making it ideal for incredibly detailed shots. The a7ii has a 24MP, making it the least expensive, almost the base of the a7ii lineup. They do not all shoot 4k video, but all have full frame sensors to produce professional level photos.
Sorry, there was a problem. Please try again later.The standard A7II is 24MP and does not support 4K videos. The A7SII is 12.2MP and can record 4K@30fps and 1080p@120fps. The A7RII is 42MP and can shoot 4K@30fps and 1080p@60fps video.
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