The A6600 has generally better AF as well as animal Eye AF. The larger battery is fine but, is way down on my list of features that I like. I like to shoot with a pair of APSC cameras and purchased the A6400 to mesh with the A6500 which I owned. I was then able to get an A6600 on sale at a price just a little above what I received for my A6500 - so I figured why not?Thank you Richard you are saving me from spending more cash, I keep looking at full frame.
Do you see, apart from full time AF and the bigger battery, any big difference between the a6500 and the a6600.
Thanks for your thoughts.