It must be all in the lenses. Having read Michael's field report on the S2, I can't see anything much to rave about.
As an amateur, when I look back on the photos I've taken throughout the years, stretching back to my first 'proper' camera, the Pentax Spotmatic, (but excluding very basic cameras such as the Brownie Box camera which I briefly used as a kid), I find that the rejects are never due to lack of resolution of the lens/film/sensor, but always due to other factors such as (1) too slow a shutter speed, (2) inappropriate aperture for DoF requirements, (3) uninteresting lighting, (4) uninteresting composition (5) lack of a suitable focal length of lens for the subject, (6) blown highlights, (7) noisy and degraded shadows, (
wrong exposure, (9) misfocussing etc, etc. I could go on, but you get the picture.
This is why I'm sympathetic towards Ken Rockwell's controversial point that the camera really doesn't matter, but it's a point not to be taken too literally because obviously you cannot take a shot which requires a telephoto lens if you don't have such a lens, and you cannot take a photo at all if you don't have a camera.
To the extent that the camera
does matter, the features that I find most useful are the features which make it easier for me to avoid at least some of those pitalls mentioned above. The invention of the image stabilised lens (or anti-shake sensor) was a great leap forward in Photography. Brilliant high-ISO performance is another great leap forward. (A lens like the new Canon 100/2.8 IS Macro with its 4 stop advantage, coupled with a camera like the Nikon D3s would be very appealing).
Fast and accurate autofocussing, a fast frame rate, autobracketing of exposure and ISO, are all features that makes it easier to capture the moment sharply and with full dynamic range when the SBR of the scene is high. A high resolution LiveView LCD screen provides no excuse for not obtaining absolutely accurate manual focussing under conditions which allow for tripod use.
The Leica S2 just doesn't make the grade for me. No image stabilisation; no LiveView; no autobracketing; slow frame rate; maximum ISO of only 1250 which looks rather noisy; and a dismal 93-95% coverage in the viewfinder.
What's going on here?