I'm wondering if anyone tried out the Rodenstock Rodagon 80mm f/4 and f/5.6. Are there any differences in terms of sharpness? Are both 6 elements? Other differences that you may think relevant are welcome

I've also tried to search here at apug and google and I could find any real comparison between those two
BTW, this is my first post... sorry if I'm posting this in the wrong place