Originally Posted by njlarsen
One more example: the high quality Oly M.Zuiko Digital ED 40-150mm F2.8 Pro (880 g, 160 mm) is as far as I can see most similar in reach (for DX camera) to the nikon AF-S Nikkor 70-200mm f/2.8G ED VR II (1540 g, 209 mm).
Not sure if these are a match in terms of quality but food for thought depending on a user's quality requirements. Price tag varies accordingly.
Nikon AF-S DX Nikkor 18-140mm f/3.5-5.6G ED VR 490g 78x97mm
Nikon AF-S DX Nikkor 55-200mm f/4-5.6G VR II 300g 71x83mm
I'm not an expert on any of these. I'm only sharing my thoughts from what I have discovered over the last two months after I decided to switch. Manufacturers seem to be making more use of composites in lens bodies to keep the weight down. Not a problem. Modern jets have bodies made from composites. They are also providing light weight small bodies for those who want a smaller form camera.