I went through this exact dilemma when I picked up my L-mount kit last year. Honestly, I ended up getting the Sigma 85mm F1.4 DG DN Art and I have no complaints at all about the performance. From a technical side, the way they corrected for axial chromatic aberrations is just impressive. I used to shoot weddings with the old DSLR version and that thing was a total boat anchor, but this mirrorless DN version is much more manageable at around 630g. Last August I shot a full 10-hour day in the heat and yeah, my wrist felt it by the end, but looking at the files on my monitor later made me so happy I pushed through. The micro-contrast you get from those 5 SLD elements is just on another level compared to the Panasonic Lumix S 85mm f/1.8. Dont get me wrong, the Lumix is a solid workhorse and it balances on the S5II perfectly, but if you want that clinical sharpness where you can count every eyelash at f1.4, the Sigma is the one. MTF charts show the Sigma stays much flatter toward the edges too. I find the Lumix gets a bit softer in the corners which usually doesnt matter for headshots, but for those wide bridal prep shots, I prefer the edge-to-edge resolution. If youre worried about the fatigue, maybe grab a Peak Design Clutch Camera Hand Strap or even a dual strap like the HoldFast Money Maker 2-Camera Leather Strap... that basically saved my life during the reception. The Sigma just works well for professional deliverables where you need that extra bit of wow factor.