I have the 12-50mm kit lens and a few others... all inexpensive primes from Oly. From reviews, all these lenses are "fair to mediocre". None are sharp, fast or distortion free. But reviewers are doing 100% crops, running the lenses through electronic analyzers and basically comparing them to $4000 Leica glass by expecting so much. But most of us post pictures on the web and aren't blowing the photos up to 36" x 48" movie posters. Anyone agree?