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There's three of 'em (well, four if you count the a7 ii).
A7s = 12mp, silent shutter, stoopid high iso, full sensor read-out for video, 4k, blah blah...
A7 = 24mp, good all-rounder.
A7ii = same sensor as A7 but with better AF, ergonomics (shutter button is where it should be) and most importantly, in-body image stabilisation for any lens you mount on it, no matter who its made by. Just select the focal length and it'll adjust itself accordingly.
A7r = 36mp monster. There are some caveats - it has an incredibly loud shutter that has also been blamed for shutter shake.
Also, if you're picking between one of these and a D800, Sony use compression on their RAW files. They're sampled down from 14 to 11 bit and you may see artefacts in high-contrast areas. Its really not a big deal because they still destroy anything from Canon but a D800 will give you uncompressed, 200mb 14 bit files, if you so wish. And better battery life.
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Well_is_it
Mate bought an a7s the other day which is pretty nuts actually, didn't even know about the a7r really. I'll have a read
ta