panasonic lumix s 100mm f/2.8 macro

I just watched Ted Forbes first look at the new Panasonic Lumix S 100mm f/2.8 Macro lens and I'm astonished how small and light that thing is for a 1:1. I've been impressed with the Panasonic L mount lenses, they seem to be smaller, lighter and use as good if not better than the Nikon Z mount...