Image courtesy: SLRgear.
SLRgear (Click here) tested the new Olympus 40-150mm PRO lens and writes:
Olympus is making a big splash with the new Olympus 40-150mm ƒ/2.8 Pro lens. No longer are professional and enthusiast photographers beholden to their large, heavy DSLR telephoto zooms if they want a tele lens with bright apertures, rugged weather-sealed build quality and compatibility with teleconverters. Not only are images tack sharp and the build quality outstanding, but the size and weight is also refreshingly light for such a lens. The Olympus lens measures up at around 6.3 long and weighs just a bit over 2 lbs (with hood and tripod collar attached), whereas a comparable 70-200mm ƒ/2.8 DSLR lens, such as the Canon 70-200mm ƒ/2.8 Non-IS lens is 7.6 inches long and weighs almost 3 lbs. (for the IS Mk II version, you tip the scales at about 3.3 lbs.).
For Micro Four Thirds shooters, the 80-300mm-equivalent focal length range on the 40-150mm ƒ/2.8 is tremendously versatile, and when you factor in the addition of a 1.4x TC, it makes this lens quite a powerful and flexible, shoot-almost-anything lens. From portraits with nice, out of focus backgrounds, to sports and even wildlife, the 40-150mm ƒ/2.8 is able to “reach” all of these subjects, for the most part. And the fact that it’s a fixed ƒ/2.8 lens makes it great not only in lower light shooting but also for increased subject isolation (and we found the bokeh on this lens to be very nice as well). In short, if you want the best, premium telephoto zoom lens for Micro Four Thirds currently available, this is the one.
BestMirrorlessCameraReviews (Click here) made an in-depth comparison between the new Olympus 40-150mm f/2.8 and the Panasonic 35-100mm f/2.8:
The M.Zuiko 40-150mm is the more interesting option in terms of image quality and performance. The 50mm of extra reach can prove very useful in different situations such as event work or portraiture. The MC-14 teleconverter is also an extra accessory that makes this lens even more interesting. I also prefer its bokeh rendering.
40-150mm f/2.8 PRO lens at Amazon, Adorama, Bhphoto, GetOlympus. In Europe at Wex UK, Technikdirekt and Amazon. In Asia at Digitalrev.