One thing I miss about my DSLR
I think you would have been happier with NEX-6 for these kind of shots. I've demonstrated in another thread that I can get a good number of shots with PDAF with
my daughter running towards me pretty quickly.
This is a horizontal motion in good light which should be a lot easier for NEX-6 to nail then forward motion. NEX-5R or 6 should have been your choice.