Thanks to @unlo I became aware that there's a Ver. 02 firmware for the FE 1.8/50mm. Now this update was overdue the day the lens came on the market because its autofocus in AF-S mode was mind-blowingly slow; oddly enough AF-C was much better. At this moment the firmware updater is only available from Sony Japan. Now I've never been accused of being patient, so I took the plunge and downloaded the Mac version of the updater. I was greeted by a Dutch introduction so that seemed alright and updating went like a breeze. So, does the lens better now? Yep, it does. Initial movement to the focus point from a largely different one remains as fast as before (I think), probably the focus motor is moving at max. speed. However, in AF-S it doesn't overshoot as much before hitting focus, making it snappier. This helps a lot if focussing takes place within a fairly narrow range. To put it in perspective, focussing in AF-S is now simply slow instead of a total embarrassment. Don't notice a lot difference in AF-C speed but I'll know more about that after tonight when I'll head out for some street shots. For you sceptics there's a quick impression of focus speed. The A7R2 operates in AF-S, flexible spot, medium size. AF accuracy is about the same as before, I'd say. I kept a nagging suspicion that the lens had some back-focus so I set out to check it with the Spyder LensCal. I did the test with the flexible spot, small size. In AF-S focus is accurate enough, but at f/4 there's the tiniest amount of backfocus increasing on further stopping down. At f/8 it's just about tolerable, but the focus point is at the far end of the sharpness zone. Here's a full-res example. AF-C behaviour surprised me. It's quite OK at apertures between f/1.8 and f/5.6, if somewhat more variable than in AF-S. However, at f/8 it started jittering audibly and 2 out of 7 shots were not critically sharp. All-in-all the improvements aren't earth-shattering but welcome nevertheless. BTW, the update is here. For those of you whose Japanese is like mine: the big blue button is the download button; upon pressing it a window opens, click on the left blue button and the download starts.