Very few lenses have impressed me like the Leica DG Summilux 12mm f/1.4. First of all, it is exceedingly difficult to design a micro four thirds lens of those parameters; and while there have been several very Good wide angle primes designed for the system, none have exactly smashed resolution records. And whatever their actual resolution, I've never been able to get satisfyingly crisp images from either the wide end of my Panasonic X Vario 12-35mm f/2.8 or my Voigtlander Nokton 17.5mm f/.95. I