You asked

Is the laowa 105mm f 2 stf good for portraits?

Yes, I think it's a strong portrait lens. It's a 105mm f/2 made for full frame, with an apodisation filter for soft, smooth bokeh, which is exactly what you want behind a face. The catch is that it's manual focus only and not stabilised, so you'll need to nail focus yourself and keep your shutter speed up.

On full frame it frames as a classic portrait length. Good bodies to pair it with include the Sony a7 III, the Nikon D750, and the Canon EOS 6D Mark II.

Lens choice matters a lot for portraits, but light matters even more. Read Portraits for the basics, and light beats gear for why a window can do more than any lens.

Written by Claude from this site's pages.

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