What you can see here from the 5 sets you can get focus and out of focus results. This is type of test (Jumping) is very hard for the autofocus because from no were the motorbike appears in the frame and the camera must focus and release the shutter. If the camera don't manage to lock focus the the series of the shots will be out of focus (70%).If the camera lock focus then all series will be in focus.
Here is the negative side of the E-mount vs A-mount
. In any drive mode you are they work on release priority vs the SLR/SLT work on Autofocus priority.On SLR/SLT you have the option to change it if you like but on E-mount they are default from manufacture to work on release priority.
The SLT A77/99 they work also on release priority only if you use the dedicate 12 f/s for a77 or 10f/s for a99.
A positive side of this is that you can use continues autofocus at 11 f/s at min aperture(for panning) For example(11 f/s, continues autofocus, shutter speed 1/100 sec and aperture f11).
The above combination can not be done on SLT. If you turn the wheel to the speed priority 12 f/s for a77 or 10 f/s for a99 and you want to use autofocus then you cant change the aperture (I don't understand why)
My final conclusion yes this camera lens combination it can replace the a77 with 70-200G f2.8.Today I brought with me also a77 & 70-200G and I didn't took any picture.
Tonight I will post some more pictures (not AF test
Hope I have help some people they are looking for E-mount as alternative to the big heavy and expensive A-mount.
We are not far away from the time that Sony will introduce a combine AF system from A77 II & A6000.
By the way I am selling my a77(body only) preferable in Europe, if any one interested