>>3264646It's pretty good for a travel lens. And the sharpness is very decent if you take into account it's the smallest lens in its class, much smaller than the DSLR versions.
https://www.youtube.com/watch?v=efXNX7o8HAQThere is a pretty good review here that compares it to the older 18-105 lens.
The 18-135 is Significantly sharper at the wide angle where you take most of your landscape shots. Then begin to trade blows from what I remember. But it's still good at longer focal lengths.