It's common knowledge that the 20/1.7 was THE must-have lens in a m4/3s user's bag. Small, cheap, sharp, fast, wide-normal FOV. Today, there are more choices. The 17/1.8 and the 25/1.4 pretty much split off the 20's popularity, and now there's a 25/1.8. Sure, the 20 is sad about this, but it's good news for the rest of us! If the only standard zoom were the Panasonic 14-42 II for $150 then I'm sure that'd be something everyone has, but there are a half dozen lenses that cover that range, not to mention the 12-35 and 12-40, neither of which are ultimately popular amongst everyone because of the price tag and well, since there are two, the sales are split in half. Again, this is all good for us. The 75 is a one-of-kind lens, but it's too long for many uses and is prohibitively expensive. So, the ONE lens that it seems to me that every has (or everyone should have!) is the Olympus 45/1.8. On sale it's only $300 new. It comes in two colors, it's light, it's small, it gives good bokeh and has decent close focusing capability, it's extremely sharp, it can be used at 1.8 without much issue, etc. It seems like everyone just has this lens.I'm sure the 20 has sold more than this, and maybe even the 12-35 has outsold it. I don't know. But as far as native lenses go, there is nothing even close to the 45. The Sigmas are 30 and 60, plus f2.8s. Panasonic has the 42/1.2 but I can only imagine the price. The 45/2.8 has never been super popular and is not as petite physically or on your pocketbook. I'd be curious to see sales of lenses, year by year.