No, not time ror rangefinder adjustment, ath. I test lenses for infinity and know when they are focused, both for minimal distance and far distance. And mgb74, I am not talking about testing merely one camera. Several of each, over the years, have caused me to assert this.
I do not have explicit examples here but Brian seemed to nail it on the head and infered (as I do) that there is a cult status with the GIII17 that is really not warranted. (I did not wish to commit such sacrilege by boldly stating so outright, but Brian helped me to be able to affirm this.) At wide open the 1.7/40 is soft, not contrasty, and not really good at all. But stop that lens to even 2.8 and it is very good, and greatest at 5.6. At about 5.6 no lens seems better to me but, of course, there are equals. On the other hand, the 1.9/45 I have found to be surprisingly good wide open (both sharpness and contrast) and, of course, stellar at 5.6 or thereabouts. Perhaps it is a more conservative, tried and true formula but its wide open performance is clearly better by far. - David Lyga