Florian, one of our members, sent in this article that he thought others might find interesting. It begins,
For years, lens makers have fought hard to market lenses of wider and wider aperture. Wide apertures (e.g., f /1.4 instead of f /2) but a series of measurement published on dxomark.com cast some doubts on the real benefits, for digitally equipped photographers, of these progresses.
Helderberg Photographic Society 