Hello, I would like to buy the Canon EOS5D with 24-105mm f/4 L lens. How does it compare in quality with Contax 645 with 80mm Zeiss lens when printing on A3 format ? More generally does it reach the quality of a 6x4.5 medium format camera like the Contax 645 ? My question is to know if I should rather stick twith the medium format camera or go digital with the Canon (I am only speaking about quality of the final print). Thanks.