The C2 and C3's tech specs are published on Leica's website. I believe both camera's have the usual +1.5 ev feature. Vignetting could not be determined, judging from prints. I haven't seem any slides. The prints however, looked extremely well and evenly exposed, beautifully balanced and sharp. I did not notice shutter lag beyond what is to be expected. C3's shutter release is similar in design to the C1, it is almost flush with the upper deck and therefore somewhat difficult to find when you're looking through the finder. However, with a little getting-used to, I don't expect it to be a real problem. With regard to the flash, I believe the flash output is controlled bij the measured (autofocus) distance. There is no manual distance setting, as with the Minilux Zoom. Both camera's have the usual, to be expected, features and nothing more (or less). But you can expect a better than usual lens and better than usual built quality and materials and outstanding design. All in all, both seem te be very competent camera's, enjoyable to use and with a long-lasting value.