Hello everyone, I'm wondering if I should buy or not the Panasonic 20 mm f1.7. I already have several primes, as the 14 mm f/2.5, that I don't use much, and the 25 mm f/1.4, that I like a lot and use a lot. However, the 25 mm is sometimes a bit huge and a bit long. I was aiming the Oly 17 mm f/1.8 but it's quite expensive, and I think it may be a bit wide for what I like. The only thing I fear on Panasonic is the autofocus. I would use it a lot for photos without a moving subject, for which autofocus accuracy is more important that AF speed, and I think the 20 mm will be fine for that. But I would also use it from time to time to photograph children, and young children can sometimes move quite fast in an unpredictaple way. Is the 20 mm AF usable for such photos?