Have the 18-105mm G and love it, is the only lens on my a6000, 90% of the time. If I have to enter the market again, I would pick the 18-105mm over the 18-135mm for these reasons:
1)Fixed F4 and is a better G series Lens
2)Physical Build and Presents of the G lens - Nice size to grip and Metal finish, is longer and wider but non extending.
3)No AF/MF button on the G lens - Couldn't count how many times I accidentally flipped on my other lens, HATE that.
4)Power Zoom button on the G lens - Easier to zoom and powered assisted for video but most importantly for me, it triggers the Sony ImageClear Zoom without having a custom button assigned.
More detail comparison with this video.
1)Fixed F4 and is a better G series Lens
2)Physical Build and Presents of the G lens - Nice size to grip and Metal finish, is longer and wider but non extending.
3)No AF/MF button on the G lens - Couldn't count how many times I accidentally flipped on my other lens, HATE that.
4)Power Zoom button on the G lens - Easier to zoom and powered assisted for video but most importantly for me, it triggers the Sony ImageClear Zoom without having a custom button assigned.
More detail comparison with this video.
The Devil made me buy it - RFD.