I recently purchased an OM-D EM5 (body only because I had a Panny 20mm from before) and I'm loving it. But I'm finding it a little slow keeping up with my constantly moving 2 year old. Looking for a little advice. Was thinking about maybe either an Oly 45mm or a PL 25mm but I'm not sure which would be better or maybe there is another option that I'm not thinking of? Thanks!