You can compare graphs with other 43 and m43 lenses. http://slrgear.com/reviews/showproduct.php/product/1741/cat/15 "Compared to other Olympus primes and zoom lenses, the 40-150 is top notch. At 40mm, the 40-150mm edges out the 12-40mm @ 40mm at ƒ/2.8 with better corner sharpness, for instance. At 70mm, the 40-150mm displays nearly identical sharpness characteristics to the well-regarded Olympus 75mm ƒ/1.8 prime @ ƒ/2.8. And at 150mm, the 40-150mm is very similar to, if not just slightly sharper than the Olympus 150mm ƒ/2 Four Thirds lens @ ƒ/2.8 and stopped down."