As the owner of a Panasonic 14mm/2.5, I can’t decide whether to buy the 12 and need the community’s assistance in deciding. Apologies for the number of questions. Put simply, is there a compelling reason to upgrade from the 14 to 12? Yeah, I’m obviously aware of the technical aspects of the slightly faster aperture and focus ring of the Olympus but beyond that in terms of real world use and picture output, has anyone actually upgraded and concluded that the 12 THAT much better? If so why (ie colours/sharpness/ vignetting/ barrel distortion)? Does the focus ring genuinely change the way one shoots using the 12? I have the Olympus 17/1.8 and would like to know if the focus ring experience is exactly the same as with the 12. I have this impression that the ring with the 12 is somehow more relevant in practical use as compared to the 17 (I could be wrong). And apart from the obvious issue of price, is there anything else I should be considering here? Would be genuinely interested to hear the views of the community. Thanks.