It’s just a matter of time before someone starts to compare these three lenses with similar focal lengths – Olympus 17mm f/1.8, Olympus 17mm f/2.8, and Panasonic 20mm f1.7. Mingthein has published such an article. He mentions the build quality is closer to Olympus 12mm and Olympus 75mm rather than Olympus 45mm and Olympus 60mm which are plastic-built. Auto-focus speed is apparently “very very fast indeed”, even faster than Olympus 45mm f1.8. Check this review out!