Could you -- or someone else -- expand a little on this?
Little?
🙂
Let's take Color Skopar 35 2.5 as example. It is lens with huge contrast, bold saturation and simple rendering. Personally, I don't like low contrast lens, washed colors lens for color photography. Color Skopar is sweet lens for color.
Also, personally, I don't see significant importance of lens rendering for color. Too much of the character might be not good for color. To me "nervios bokeh" term is associated with color mostly.
In bw lens rendering and bokeh is more noticeable because of the absence of color. I was never satisfied with Color Skopar 35 rendering on scans and prints. Overkilling contrast and flat rendering on BW. It just missing some "parts" of the rendering from Leica lenses or other Voigtlander lenses.
In bw, old, uncoated lenses are in opposite, they give widest tonal range and amount of details, but tends to flare and loose too much contrast, even if they are clean optically. To me lens with medium contrast and medium, but not flat rendering is optimum. For prints, some prefer to have less contrast to be able to adjust it in enlarger or by single contrast FB paper.
35 Cron V5 will give very specific rendering of object in focus and it might be something to benefit on large prints. Or both versions of Ultron 35 ASPH which are superior to Color Skopar in BW and have less aggressive pronunciation of infocus part, while keeping nice, smooth, not as "cold" overall rendering as from Zeiss.
IMO.