The Panasonic Lumix G Vario 7-14mm F4 is a remarkable lens - it may not be the widest angle zoom currently made (an honor held jointly by Sigma's 12-24mm for full frame and 8-16mm for APS-C), but its combination of ultra-wide view and compact size is unique.
Extraordinarily small for such a wide lens; Very good image quality; Extremely fast; practically silent autofocus with minimal 'breathing; Impressively resistant to flare
Does not accept filters; Fairly strong lateral chromatic aberration at the widest settings when used on Olympus bodies; High price (much more expensive than Olympus 9-18mm F4-5.6