Yes,
If weight is THE most important priority, I can see how many would be disappointed with this... The official weight is 2.8 lbs., 3.25 lbs. with the tripod foot. I see it differently. If the lens is well-built, i.e., made of metal, and I hope it is, then I'm guessing it probably cannot be a whole lot lighter.
A couple years back I was told that the longer the focal length of a lens, the more you lose the ability to make it smaller/lighter for smaller sensors. We all see how much smaller our short lenses are in the micro-4/3 format, and I naturally figured the same would be true proportionally for longer lenses... But apparently as the focal length gets longer, the size of a lens increasingly is dictated by size of the front element, which is in turn dictated by the maximum aperture of the lens... Consider that this lens has a 77mm filter thread. That makes the front of it equal in size to a full frame 300mm f4 lens. It also has a lot of glass... 17 lenses/10 groups. So I'm thinking the optical designers probably did what they had to do... You can't get something for nothing. The pixel density is very high on our micro-4/3 camera sensors (and soon they will probably pack even more pixels onto the next generation E-M1 II), so we need extremely high resolution lenses in order to get all the possible resolution out of the sensor. If this truly proves to be equal to or sharper than the old SHG Olympus lenses, I think I'm going to want it. Also just a small note but I'm very pleased that the lens foot appears to have an Arca Swiss groove. More photos from 43 rumors attached.
Dave