Which Sigma L-mount prime lens is best for portrait photography?

Hey everyone! I recently made the jump to the L-mount system with a Panasonic Lumix S5II, and I’m absolutely loving the colors and the overall feel of the sensor. However, I’ve been relying on a standard zoom for a while now, and I’m finally ready to invest in some serious glass to step up my photography game. Since I do a lot of portrait work—mostly outdoor lifestyle sessions and some tighter headshots—I’ve been looking closely at Sigma’s prime lineup because their Art series has such a stellar reputation.

Sigma has so many incredible options for the L-mount, but I’m honestly feeling a bit overwhelmed by the choices. The 85mm f/1.4 DG DN Art seems like the gold standard for most, and I’ve heard nothing but praise for its sharpness and beautiful, creamy bokeh. But then I see the 105mm f/1.4 'Bokeh Master' and I start wondering if that extra reach and incredible background compression are worth the massive size and weight. I often shoot for a couple of hours at a time, so portability is a slight concern, but I also don't want to compromise on that 'dreamy' look my clients love.

I’ve also been curious about the 135mm f/1.8 Art. I love the compression it offers for outdoor shots, but I’m worried it might be a bit too tight for some of the smaller indoor spaces I occasionally work in. On the flip side, some people swear by the 50mm f/1.4 for a more natural, environmental look. My budget is flexible, but I want to make sure I’m picking the one lens that really defines the 'Sigma look' for professional portraits.

For those of you who have shot with multiple Sigma primes on L-mount bodies, which one is your absolute favorite for portraits? If you could only bring one prime to a professional shoot to guarantee that 'wow' factor, which one are you grabbing? I’d especially love to hear about the autofocus reliability and how these lenses handle wide open at f/1.4. Thanks in advance for the help!