Thank you, John. I love the 100 APO for portraits/headshots. it is also strong at infinity, with similarly lush colors. The focus throw for portraits is manageable. For long to infinity, there is not a lot of travel in the focus, so it is easier than some lenses to miss it WO. That said, it is much sharper across the frame from WO to about f/5.6 at infinity than the Contax 100/2.
Because of the weight of the Leica lens, rather than its performance, I generally shoot landscapes with either the Contax 85 or 100.
Jim