One of the biggest, most marketed advantages the SNES had over the Genesis was Mode 7 graphics. My understanding of the Sega CD is that it substantially beefs up the Genesis' processing power and allows hardware scaling and rotation but not more colors. How substantial is this? How does it stack up against the SNES? I understand the SNES could only rotate/scale the background layer with Mode 7. Could the Sega CD rotate/scale sprites too? How does it compare to SNES with extra chips?