Here is a quick specs comparison on Sony a7R III (Amazon/B&H Photo Video/Adorama) and a7R II full frame mirrorless cameras. There seems a7R III has a lot of improvements over a7R II. See the detail below. See also: a7R III Vs. a9, a7R III Vs. D850
Sony Alpha Mirrorless Cameras, Compact Cameras & Lenses Rumors
Here is a quick specs comparison on Sony a7R III (Amazon/B&H Photo Video/Adorama) and a7R II full frame mirrorless cameras. There seems a7R III has a lot of improvements over a7R II. See the detail below. See also: a7R III Vs. a9, a7R III Vs. D850