It's more of an everyday kind of lens that makes you want to bring out your DSLR more often. To my knowledge , there are only 3 pancakes - Zuiko 40/2, Contax Tesser 45/2.8 and this. This being the only one that will be available in native EF mount, with AF confirmation and aspherical lens element.
That's right.
Pancake size is tempting.