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I know you're just making a joke, but "slow" and "fast" is absolutely dependent on sensor size. The equivalent 4/3 lens to this would be the Olympus 35-100 f2, which is larger, twice the weight, and $2500.
For those that like to calculate their depth of field and use it artistically, knowing the speed equivalences between different formats is important.
Yup, that old law of physics just keeps getting in the way. m43 owners keep thinking owning a small sensor equals much smaller lenses. It's simply not true. You must still sacrifice something to get smaller optics. I was recently checking out the images from the 35-100 on flickr (I keep thinking m43 might be fine for zooms) shot wide open. I've owned both the 70-200/2.8 and f/4 versions for Canon and Nikon and am familiar with the looks of those lenses. The Panasonic just doesn't have the same look. I'm sure it's a fine tele zoom if all you want is to bring subjects in closer, but if you're used to a certain look on FF and want that look in a smaller package, it's nearly impossible to do. It is one reason I mostly shoot primes now. I sacrifice zoom for a smaller package and zoom with my feet now.