I have a bit of a quandary.  I'd like a prime lens for my Olympus and was thinking about the Olympus 25mm f1.8 and went into the camera shop ready to order it.  Then the dude said what about the Panasonic 20mm f1.7? And I'd read reviews that it was a little on the slower side when it came to focusing. He's lent me his Panasonic 20mm to try and it's a great little lens, takes beautiful photos and it's a pancake (bonus) but it really is quite a bit slower on the auto focus, which wouldn't be a problem if your target is slower moving, not ideal when it's an active two year old! 
What to do?!?!?!?!