Panasonic 12-60mm F/2.8-4 OIS is the premium grade micro four thirds lens. At around $1000 it is not exactly affordable but promises (and delivers!) high image and build quality together with weather sealing and optical stabilization. It is also rather light at only 320g what is impressive considering Olympus had a lens of identical focal range and aperture at 575g back in the days when they produced DSLR cameras. Anyway, you can see my entire review on YouTube and just below there are crops at various focal legths and aperurtures to judge sharpness.