In my search for an all in one lens for hiking, my 24-105 f4 arrived today and I have to say that coming from a Tamron 28-75 it's a real pleasure to use. I know it has no bearing on the final image but the zoom and focus rings make the Tamron feel like a toy. Now it's just a matter of using them side by side for a bit before deciding if I want to keep the Tamron for those times the extra stop is needed.

