A:
There are some notable differences.
-the A7ii has 5 axis in-body-stabilization. Very helpful if you have lenses without OSS. The A7 doesn’t have this feature.
-Ergonomics. The bottoms are better placed on the Mark II , the shutter is now on the bigger grip, rather then the top of the A7. The camera is a little heavier but not by much.
-AF focus feels more responsive on the Mark II from my comparisons (I own both bodies)