anyone out there have both of these zooms, or used both? i currently have the 14-140 that came with the GH2 but i'm curious as to whether there's a significant IQ bump with the PL 14-150. besides the weight of the 4/3 lens (and having to use the adapter) and the silent operation of the 14-140 for video, what are the other significant differences? is the AF speed similar? any input from the board would be greatly appreciated! Andrew.