I am considering a 150mm lens - either an Apo Sironar S or N.

In another thread, mention was made that w/r/t 135mm Apo Sironars, the Apo Sironar N would be better suited for work at infinity focus, whereas the Apo Sironar S is better suited for closer focusing. This difference is attributable to the inherent lens design (optimization) differences between the two versions.

I searched other threads but did not find an answer to this as far as 150mm Sironars is concerned. I'm wondering what experience others might have had with actual use of these lenses and if the same comment holds true.

Most of my work is landscape photography and does not involve closeup work. However, I prefer a lens that is as sharp as possible at infinity. Does that preclude the Apo Sironar S, which by reputation is considered a better lens ? Perhaps the S would not be a "better" choice for my purposes if the N is designed for optimum infinity focusing.

Thanks in advance for your input any any experience with the lenses mentioned.