Is Panasonic's Lumix S 20mm f/2.5 Sharp Enough?

Panasonic's Lumix S 20mm f/2.5 is a small, light, $498 ultra-wide prime for L-mount full frame bodies, and it sits at a focal length plenty of people treat as their everyday wide. At that price and size, the open question is how much optical quality Panasonic had to give up to keep the lens this compact. [Read More]