Suggest a 12" (300mm) lens for portrait work on 8x10?

[Ari]

I tend to favor a narrower view, and a bit more space between me and my subject, hence I went with the 420mm version of the L, and I like it a lot. Really gentle rendering at wide open and sharp till it hurts when close down to about 22/32.

Good Covid focal length, I guess. And portrait FL preferences vary quite a lot. I couldn't go longer than 360, but some people like 420, 500 and longer.

This is a soft lens. Ari wants a sharp one.

I had that lens, Andrzej, and liked it, but not my style. Thanks