In the last couple of years or so, I've been back doing some photography after a very long period of just snapping during the holidays. I have set up a digital darkroom, and tried out various types of cameras and lenses.
The more I think about it, the more I am convinced that from the technical point of view, once you have a rig with a good digital sensor, or a film one with a decent film and scanner, what really makes a difference in your images is the lens.
This not only relates to sharpness, but also to the type of drawing, in and out of focus passage characteristics, 3D rendering, colour rendering, flare resistance, versatility, size and speed.