u/OVOxTokyo

I'm using a Panasonic S5IIX with the kit 20-60mm for handheld low light video in close range. Will I significantly benefit from the Panasonic Lumix S line? I've been told that a 50mm lens is necessary to have true-to-life perspective for portraits, but I've seen the 18/24/35 lenses and they don't look bad at all, but my opinion isn't educated. Since it's handheld and close range, I'm considering the 3 lenses I mentioned earlier over a 50mm. Which one would be best suited for my needs? I've also considered the Sigma 20mm f1.4 but it's really big so it doesn't look like the best option for handheld videography. Is the Sigma 20mm quality significantly better than the 18mm Lumix S?