Panasonic 100-300 a good lens?

Jezebel Masterson wrote:

It is going for $500 on B&H, and I am ordering a GH2 tomorrow with the 14-42. I am either grabbing the 45-200 or the above, but I haven't found any MTF charts on the -300. Is it decent or just a generic long tele? I already have a sony for stills, so my GH2 will likely be mainly for video, although in sufficient light I may just keep the Pana out for stills too. Don't want to buy a junk lens, and with ETC the 200 will be equiv of 1000mm which is outstanding for such sharp video. Thanks in advance for info.