I have the 28-135 that I use for video, but also for stills.
The quality of my copy is pretty decent (also thanks to lightroom CA very good correction), but definitely is not at the professional grade.
What do you think is better?
1) sell the 28-135 and buy the 24-105
2) sell the 28-135 and buy the new 24-70 f4 (no 105, but better macro, sharpenss and IS then solution 1)
3) just buy the 24-70 f4 and use it for stills, while using the old 28-135 for video and as a backup
What do you think?