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Yes, the lens can take quite a bit of sharpening without looking too ridiculous There is a line - probably related to what the eye expects to see - beyond which it's too much, that plus the sparkly highlights. On the RX1, it is a pretty good gradient and quite easy to set for personal taste. Partly this is sensor related, I see the same thing with the a99, and have modified sharpening technique.
I did a very demanding set yesterday on targets varying between 80-300 metres and have settled on yes, f5.6 for best overall quality if DoF is sufficient. f11 is starting to show loss of resolution on my copy. At the other end, yes f2 is wonderful but f2.8 sees a big step up, and f4 is fine.
Focus accuracy. Being a manual focus person, the 'focus by wire' focus technique is not ideal because it is neither linear nor the same in each direction. I would love a good trad style ring on this one. At the limit of what the EVF can resolve, the image dances a little. For closer subjects it is quite easy to get focus as good as AF, and AF suffers from the large box, can miss to a closer or farther subject but you can miss seeing it.
I use AF like Wayne, and intend to (where the subject permits) to check with MF mag - since if you touch the ring it mags right away to give you a decent check. Time will let me get better at this.
I tried (successfully until now) not to comment on Martin's woes, but I do feel the lens may have been OK - you have to very careful with focal distances to extreme L-R image content in identifying such issues with a wider than normal lens. The image shown was inconclusive to me. There may be no true infinity with this system.
You can easily see the effects of distortion correction by clicking the tick box on/off in detail rendering, it is quite a stretch. It is a big shift but I believe for most images still a good thing, can be taken up with marginal increase in sharpening. [The Touits have surely something similar in processing.] CA is very good as determined by 'tree twig torture testing' (TTTT).
I feel Tim A was interested to establish 'final resolution' hence his approach. To an extent, images will always looks too sharp to some tastes. Finally, a link to some RX1 images elsewhere, look for Mark Gowin's images 2/3s down the page:
He is another guy getting more confidence in its capabilities.