What lenses were you using with the Arca Swiss and what lenses are you now using with the Canon 1Ds?
What is your sharpening workflow in digital? (When I made the transition from film to digital last year, I found that the emphasis of my workflow switched from color-balancing and dust-busting to sharpening technique, which I solved by purchasing and using PK-Sharpener Pro from Pixelgenius.com)
My experience with the 1Ds, limited to inkjet prints - not brochures - indicates that with good exposure, and the grass and leaves in focus (note this is different from sharpening, which is an acutance, not a focus related issue) and appropriate post-processing you can virtually count the leaves and blades of grass, unless they are in deep shade, in which case some luminosity blending becomes helpful.