Honestly I am so fed up with this 20-60mm kit lens that came with my S5II its driving me nuts. I thought I could make it work but the aperture jumping around every time I zoom in even a little bit is killing my video shots and its just not sharp enough for the low light stuff I have to do. Im actually really excited because I just booked a huge outdoor wedding gig in Seattle in three weeks and I finally have the budget to get something legit but I dont want to waste money on another lens that doesnt do everything. I need one lens that can basically stay on the camera the whole time because switching in the rain is gonna be a nightmare and I dont want sensor dust everywhere. My budget is like 1500 max maybe a little more if it's really worth it but I need something fast and versatile.

I was looking at the Sigma 24-70 Art because everyone says its the gold standard but then I saw Panasonic has their own 24-105 which has the extra reach and OIS which would be great for handheld. But then there is the new version of the Sigma too and I just cant decide which one is actually the best do it all workhorse for professional work. What is the best all-around zoom lens for Panasonic L-mount cameras that wont let me down?