I've just taken the plunge and bought a secondhand 24-105L to replace my secondhand 28-135mm. Have I done the right thing? As I'm waiting for the L to arrive at the beginning of the week I'm wondering just how much better is the L than the 28-135? Suppose I'm looking for reassurance really. I've read loads of reviews, forum posts (here and elsewhere) and anything else I could find about both lenses and have come to the conclusion that for 100 posts there will be 100 different opinions! I am most concerned about the upgrade of the optical quality since my camera body isn't weather sealed having a weather sealed lens seems a bit of an unnecessary luxury. I've only tried out the L in Jessops so haven't had much experience of it though everyone raves about it. Replacing the lens with one of similar length seemed the best thing as the 28-135 was a good choice. I don't tend to shoot wide (landscapes etc) so even on a crop body the reach suits me.

I'm selling the old lens on eBay since the local independent camera shop only does secondhand sales at a whopping 25% commission and the photography section on Craigslist doesn't appear to have a lot of activity in this locality.

I just hope I don't regreat spending the extra cash.