Can't really help either as I also have a Mk1 A77 and 70-400G. My Mk1 G is a fantastic lens and my only complaint is that the zoom action is too stiff causing it to jump rather than glide.
I'm not investing any more in Sony until I see a real commitment to A mount. To the contrary, I am selling kit I don't use or use infrequently. 11-18 and 18-250 going next and maybe even my 70-200G and 1.4TC
Putting it in the piggy bank for future purchases of either the A99ii (with all the advantages of the A7Rii but in dedicated A mount) or my new Canikon kit. I'm not saying the other systems are perfect, in fact in many cases they are far from it but I've played with similar Nikon kit and I could happily live with that system. Not sure about Canon yet but I hope to get a loan shortly for a play.
If the above kit is sold, only an A77II and Tamron 16-300 left sadly. Sony cannot supply what I want so rightly or wrongly I've branched out to someone who does and I'm very happy.