Returned my a7rII for an a7sII but one thing I miss is the amazing autofocus in video mode on the a7rII. I think it's honestly pretty close to the c300II although only with native e-mount lenses. Still impressed with the a7sII video autofocus coming from panasonic bodies that always hunted even after they found focus. I know most don't use this feature, but it's definitely nice to have in a pinch and although the a7sII is a little slower, it does a great job at tracking faces and has a nice smooth transition between focus pulls.