Well I'm getting shot of the 70-350
I had it out today in the park - great light, settings correct, plenty of shutter speed, eye af locked on (allegedly anyway) etc etc - virtually no properly sharp shots, nothing anywhere near what I can get with the RX10iv. Fed up with it now.
Might get a Tamron 50-400, or else just use the A6700 for landscapes (with 10-20) and macro (90mm maybe) and stick with the RX10iv for wildlife as I am a pretty casual walkabout shooter anyway.
Just so this isn't purely a moan here's a shot I got with the A6700 and 70-350mm (not very good as it was a fair bit away - not blaming the lens for this one!). First one I have seen so quite exciting at the time
Greenshank by
Mike Smith, on Flickr