See section 150mm Voigtländer Lanthar versus Sironar-S :
https://www.largeformatphotography.i...rtrait-lenses/
If wanting great bokeh alternatives are Ysarex, Xenar and Heliar...
The Lanthar sharpness+bokeh nature has a german description: Duftige Schärfe or amazing "fluffy sharpness", as that article explains. This is what you find in a lanthar... but for portraiture excessive sharpness may not be always what you want anyway, perhaps some may prefer a tessar for that, following Karsh exemplary usage of Commercial Ektar 14" for 8x10, what it would be a 180mm tessar for 4x5.
So for landscape if all in focus (bokeh not useful there) the lanthar has no advantage aganist a modern lens. For portraiture you have the good bokeh but high sharpness may not be necessary/wanted. If wanting smooth OOF with something very sharp in focus, Duftige Schärfe nature, then the lanthar will rock, but then the question is at what print enlargement a (good bokeh) LF tessar is not sharp.
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