Everyone else - please join in.
I'm a bad person to be testing this - because tracking dogs running is something I never managed to succeed with - even in the days of the D2x.
At any rate - this morning I put the 70 f1.8 on the E-M1 and took the dogs for a walk.
Milo is a 2 year old bedlington-whippet cross - he is FAST
Matty is an 8 month old Pyrenean sheepdog - she is really manouverable.
I just put it on C-AF, mostly at f1.8 and fired away to see what happened. They are cropped where relevant.
There were one or two OOF where the dogs ran straight at me and were very close, but basically everything else was fine