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I am enjoying it, the changes may not be major but I found them handy and had some cash around at the time so went for it
the ones that come to mind are

the viewfinder is improved and the auto switch from eye to screen seems quicker and more reliable to me
it also has three custom settings on the dial which I use a lot if shooting scenes and a bird comes into view I can quickly switch my default starting settings for flying birds
I am sure there are some other small changes but those are the ones to come to mind

That all said the A7111 is great and is it worth it to upgrade if tight for cash erhaps not to be honest