This head-to-head comparison with the best DSLR available today, the Nikon D3x, really shows off the stunning combination of 37.5 megapixels and the Leica 70mm f/2.5 Summarit-S ASPH. See it and Believe. But I did have to use manual focus, because autofocus could not deliver peak sharpness on the test scene.
Also provided are RAW files from each camera at f/5.6, as well as extensive crops from f/2.8 through f/22. Really an all-day job on this one.