<p>Sanford, I hope this is not a dead thread but the truth is I don't visit PN much nowadays.<br /><br />I had an X-E1 which I found was quite erratic in focus in some situations. Setting the focus area to the largest size ameliorated the problem --somewhat. <br /><br />Some months ago I traded it towards an X-E2 and the problem is completely gone. I'm waiting for a 27/2.8 at the super reduced price to arrive tomorrow, so I don't yet have any experience with this lens, my experience applies exclusively to the kit 18~55/2.8-4 zoom, but for what I've heard from other owners of the pancake 27, it blazes!<br /><br />Keep in mind that the X-E2 has a superior hybrid focus system using contrast and phase detection, while the X-E1 relies solely on contrast. As soon as the new body was affixed to the 18~55 the hunting was gone, so the culprit was the body, not the lens. Also, the phase detection system is <em>a feature of the new sensor</em>, so no FW update is gonna correct that on the X-E1.<br /><br />With the ultra low prices of used X-E2's you might want to consider a trade up. I ended paying less then $150 for the upgrade. The body is very improved in a lot of ways, not only focusing.</p>