I just wanted to gather thoughts from other people about what they believe makes a micro four thirds lens high grade. Is it the price tag? (I saw somewhere that anything above 400usd is considered high grade). OR Is it the speed of the lens? (F2 or lower for primes, constant aperture for zooms) OR Is it the lens construction? (All metal finish or weather-sealed) It's hard to set a price cutoff for high vs. standard grade lenses (the OM-D 12-50mm kit is at 500usd when sold separate from the kit). A lot of people argue that the Oly 75-300mm lens is not worth the 899usd and is too slow to be considered high grade. (Am personally very happy with this lens which shoots sharp pics with the E-M5) On the other hand, while the Oly 45 f/1.8 is definitely a steal and an extremely capable 'FAST' lens, one can hardly call it high grade because of it's plastic finish. The ones I've seen/read people consistently refer to as high grade MFT lenses are the Oly 12mm f/2, Oly 75mm f/1.8, the 2 PL lenses and the soon-to-come Oly 60mm macro. Thanks to everyone for reading. All comments are welcome.